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A1 noun #3,040 最常用 5分钟阅读

開放

kaihō 前3,040

开始练习例句笔记与提示開放 30秒了解

解析開放 in your Level:

At the A1 level, you should learn '開放' (kaihou) as a word for 'opening' things like windows or doors to let in air. Think of it as a formal version of 'akeru' (to open). You might see it on signs in a classroom or a park. For example, 'Mado o kaihou shimasu' means 'I will open the window.' It is a useful word to know when you are in a public space and want to describe the state of a facility being open for everyone to use. You don't need to worry about the complex economic meanings yet; just focus on the idea of 'opening a space'.

At the A2 level, you can start using '開放' to talk about public facilities. Phrases like 'Koutei o kaihou suru' (opening the schoolyard) are common. You should also recognize the word '開放的' (kaihou-teki), which means 'open-minded' or 'airy/spacious'. If a room has a lot of sunlight and space, you can say it is 'kaihou-teki'. You are learning that this word is more about 'accessibility' than just the physical act of moving a door. It's about letting people in or letting air flow freely.

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At the B1 level, you should distinguish between '開放' (opening a space) and its homophone '解放' (liberation). You will encounter '開放' in news contexts, such as 'shijou kaihou' (market opening). You should be able to use it as a noun in compound phrases. You might also see it in the context of technology, like 'open data' or 'opening an API'. At this level, you understand that '開放' implies a transition from a 'closed' or 'restricted' state to an 'accessible' one, often involving rules or permissions.

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At the B2 level, you should master the nuances of '開放' in professional and literary contexts. You will use it to describe abstract concepts like 'opening the heart' or 'opening a system to external influence'. You should be comfortable with the passive form 'sarete iru' to describe ongoing public access. You will also recognize it in formal warnings like 'kaihou genkin' (do not leave open). You understand the social implications of 'kaihou'—it often implies a generous or democratic act of sharing a resource with a larger community.

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At the C1 level, you can use '開放' to discuss complex socio-political issues, such as the 'opening up' of a country's culture or economy to global influences. You can analyze the difference between 'kaihou' and similar terms like 'koukai' (disclosure) or 'teppai' (abolition of restrictions) in academic writing. You understand the philosophical sense of 'kaihou' as a state of being unburdened by structural walls, whether they are physical, social, or psychological. Your usage is precise, reflecting the formality of the situation.

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At the C2 level, you possess a native-like command of '開放'. You can appreciate its use in high-level literature to describe the 'opening' of an era or the 'unfolding' of a complex architectural space. You can use it in nuances that imply structural transparency and systemic inclusivity. You are also aware of historical contexts where 'kaihou' was used in slogans or policy documents. You can effortlessly switch between the literal meaning of opening a window and the metaphorical meaning of opening a civilization to progress.

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开始练习例句笔记与提示

開放 30秒了解

開放 means opening up spaces or systems for public use or air flow.
Commonly used for schools, parks, windows, and markets.
It acts as both a noun and a 'suru' verb.
Do not confuse it with 解放 (liberation), which is pronounced the same.

The Japanese word 開放 (kaihou) is a versatile noun and suru-verb that primarily describes the act of opening up something that was previously restricted, enclosed, or private. At its most basic level, it refers to physical actions like opening a window to let in fresh air or leaving a door unlatched. However, its usage extends far beyond the physical realm into social, economic, and systemic contexts. When a school decides to let local residents use its playground on weekends, that is called 校庭の開放 (koutei no kaihou). When a country removes trade barriers to allow foreign companies to compete, it is referred to as 市場の開放 (shijou no kaihou).

Physical Access: This involves making a space physically accessible. For example, a private garden might be opened to the public during the cherry blossom season. The focus here is on the removal of physical barriers like gates or locks.
Systemic Accessibility: In technical or professional settings, it refers to making systems or data available to others. 'Open source' is often translated using terms related to 開放, indicating that the source code is no longer a 'closed' secret.
Atmospheric State: It can describe a feeling of openness or a lack of restriction in an environment. A room with many large windows feels 開放的 (kaihou-teki), meaning 'open and airy' or 'liberating'.

日曜日は、大学の図書館を一般に開放しています。
(On Sundays, the university library is open to the general public.)

It is important to distinguish 開放 (kaihou) from its homophone 解放 (kaihou). While both are pronounced the same, the latter means 'liberation' from a state of bondage or suffering (like 'liberating a prisoner' or 'freedom from pain'). Using the wrong kanji can significantly change your meaning from 'opening a door' to 'liberating a door from its suffering,' which would be quite poetic but confusing!

窓を開放して、空気を入れ替えましょう。
(Let's open the windows and change the air.)

Common Compounds: 開放厳禁 (kaihou genkin) - Leaving open strictly prohibited (often seen on fire doors).
開放感 (kaihoukan) - A sense of openness/freedom.

Using 開放 correctly requires understanding its role as either a noun or a verb. When used as a verb, it is combined with する (suru). The object of the opening is usually marked with the particle を (o). For example, if you are opening a gate, you say 門を開放する (mon o kaihou suru). If you are describing a state, you might use the passive form 開放されている (kaihou sarete iru), meaning 'is currently open'.

この公園は24時間開放されています。
(This park is open 24 hours a day.)

In more advanced contexts, 開放 is used for abstract concepts. If you want to talk about 'opening up one's heart,' you might use 心を開放する (kokoro o kaihou suru), though 心を開く (kokoro o hiraku) is more common for personal intimacy. 開放 implies a broader, more structural release of barriers. In business, you might hear about 市場開放 (shijou kaihou), which is the deregulation of a market to allow new entries.

Grammar Pattern: [Noun] + の + 開放: Used to describe the 'opening of [Noun]'. Example: データの開放 (opening/release of data).
Grammar Pattern: [Noun] + を + 開放する: The action of opening [Noun]. Example: 施設を一般に開放する (To open the facility to the public).

政府は海外投資家に向けて市場を開放した。
(The government opened the market to foreign investors.)

You will encounter 開放 in various public and professional settings. It is a key word in public announcements, news reports, and formal signs. If you live in Japan, you will see it on posters at the local community center or on the school gates. It carries a tone of 'public service' or 'formal accessibility'.

In Schools: Schools often have 'Koutei Kaihou' (playground opening) days where neighborhood children can play after hours. You'll hear teachers or parents say, 'Today is the day for playground opening.'
In Architecture/Real Estate: Agents describe houses with high ceilings or large windows as having a great 開放感 (kaihoukan). It is a major selling point for modern Japanese homes which can otherwise feel cramped.
In News and Economics: Newscasters use 市場開放 (shijou kaihou) when discussing international trade agreements like the TPP. It sounds very formal and official.

夏休み期間中、プールの一般開放が行われます。
(During the summer vacation, the pool will be open to the general public.)

In tech circles, you might hear about APIの開放 (API no kaihou), meaning a company is making its internal software interfaces available for third-party developers to use. This indicates a shift from a closed ecosystem to an open one.

The most frequent mistake learners make with 開放 is confusing it with its twin 解放. Both are 'kaihou', but their kanji and meanings are distinct. 開放 is about 'opening a space', while 解放 is about 'setting someone free'.

Mistake: Using it for 'Opening' a physical object like a book: You cannot say '本を開放する' (kaihou suru). For books, boxes, or eyes, use 開ける (akeru) or 開く (hiraku). 開放 is for spaces and systems.
Mistake: Confusing with 公開 (koukai): 公開 (koukai) means 'making public' or 'releasing' (like a movie or information). 開放 is more about access to a physical or systemic space. You 'koukai' a movie, but you 'kaihou' a theater for free use.

Japanese has many words for 'opening'. Choosing the right one depends on what is being opened and why.

開ける (Akeru) vs 開放 (Kaihou): 開ける is the general verb for 'to open' (a door, a gift). 開放 is more formal and implies a state of being open for use or ventilation.
公開 (Koukai): Meaning 'to make public'. Used for movies, secrets, or data. While 開放 allows you to enter a space, 公開 allows you to see or know something.
解禁 (Kaikin): Specifically means 'lifting a ban'. Used for seasonal foods (like crab season) or information embargos.

Comparison:
1. 情報を公開する (To make info public)
2. 情報を開放する (To make data systems accessible for use)

How Formal Is It?

趣味小知识

The kanji '開' is used in 'Kaisatsu' (ticket gate), while '放' is used in 'Housou' (broadcasting - releasing signals into the air). Together, they create the image of opening a gate to release access.

发音指南

UK kaɪ.hoʊ

US kaɪ.hoʊ

Japanese has pitch accent rather than stress. In 'kaihou', the pitch is typically 'Low-High-High-High'.

难度评级

阅读 3/5

The kanji are N3/N2 level, but the concept is easy to grasp.

写作 4/5

The kanji for 'hou' (放) can be tricky to write correctly with the right strokes.

口语 2/5

Easy to pronounce, but must be careful of the long 'o' sound.

听力 4/5

Hard to distinguish from '解放' (liberation) without context.

接下来学什么

前置知识

開ける (To open) 公共 (Public) 窓 (Window) 施設 (Facility) 自由 (Free)

接下来学习

解放 (Liberation) 公開 (Public disclosure) 閉鎖 (Closing/Shutdown) 規制 (Regulation) 換気 (Ventilation)

高级

門戸開放 (Open door policy) 構造改革 (Structural reform) 透明性 (Transparency) 相互運用性 (Interoperability)

需要掌握的语法

Suru-verbs

開放する (To open up)

Passive voice (saremasu)

一般に開放されます (Is opened to the public)

Noun-modifying adjectives (~teki)

開放的な空間 (Open space)

Compound Nouns

開放厳禁 (Leaving open strictly prohibited)

Te-iru form for state

開放されている (Is currently open)

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按水平分级的例句

窓を開放してください。

Please open the window (and leave it open).

Uses 'kudasai' for a polite request.

このドアは開放厳禁です。

Leaving this door open is strictly prohibited.

Compound noun: Kaihou + Genkin.

公園を開放します。

We will open the park (to the public).

Simple transitive verb usage.

部屋が開放的です。

The room is open and airy.

Adjective form: Kaihou-teki.

トイレを開放しています。

The toilets are open for public use.

Te-iru form showing a continuous state.

門を開放しましょう。

Let's open the gate.

Volitional form: ~mashou.

ここは開放されていますか？

Is this place open (to the public)?

Passive question form.

空気を入れ替えるために、窓を開放する。

Open the window to change the air.

Dictionary form used for a general rule.

日曜日は校庭が開放されます。

The schoolyard is opened on Sundays.

Passive voice: saremasu.

開放的な性格の人ですね。

They are an open-minded person, aren't they?

Describing personality with -teki.

テラス席は開放感があります。

The terrace seating has a sense of openness.

Noun: Kaihoukan (sense of openness).

資料室を学生に開放する。

Open the reference room to students.

Target marked with 'ni' (to students).

夜間は開放していません。

It is not open during the night.

Negative te-iru form.

窓を全開にして、部屋を開放した。

I opened the windows fully and made the room open.

Past tense: shita.

一般開放の時間は10時からです。

The public opening time is from 10 o'clock.

Compound: Ippan-kaihou (public opening).

もっと心を開放してください。

Please open your heart more.

Metaphorical usage.

政府は市場の開放を決定した。

The government decided on the opening of the market.

Noun phrase: shijou no kaihou.

このAPIは外部に開放されています。

This API is open to external parties.

Technical context.

情報の開放が民主主義を支える。

The opening (accessibility) of information supports democracy.

Abstract noun usage.

会員以外にも施設を開放する予定です。

We plan to open the facility to non-members as well.

Future plan: yotei desu.

開放的な空間デザインが好まれる。

Open spatial designs are preferred.

Describing a trend.

データを一般に開放する動きが広がっている。

The movement to open data to the public is spreading.

Noun + no + noun phrase.

規制を緩和して、空域を開放する。

Ease regulations and open up the airspace.

Causal connection.

その建物は、週末だけ一般開放される。

That building is only open to the public on weekends.

Adverbial 'dake' (only).

市場開放により、競争が激化した。

Due to market opening, competition intensified.

Niyori (due to/by means of).

伝統的な技術を外部に開放するべきだ。

Traditional techniques should be opened to the outside.

Bekida (should).

彼は自分自身の感情を開放することが苦手だ。

He is not good at opening up his own emotions.

Nigate (bad at).

このソフトウェアはソースコードを開放している。

This software has its source code open.

Describing software policy.

都市計画において、緑地の開放は重要だ。

In urban planning, the opening of green spaces is important.

Formal academic context.

ダムの開放により、下流の水位が上昇した。

Due to the opening of the dam, the downstream water level rose.

Physical systemic opening.

通信市場の開放が、料金の低下を招いた。

The opening of the telecommunications market led to lower prices.

Manaita (brought about/led to).

開放感あふれる吹き抜けのロビー。

An atrium lobby full of a sense of openness.

Afureru (overflowing with).

知的財産権の段階的な開放が求められている。

A gradual opening of intellectual property rights is being demanded.

Dankaiteki (gradual).

鎖国政策の終焉とともに、日本は諸外国に開放された。

With the end of the isolationist policy, Japan was opened to foreign countries.

Historical context.

自己を開放し、他者との対話を深める。

Open oneself up and deepen dialogue with others.

Philosophical nuance.

労働市場の開放は、経済の柔軟性を高める。

Opening the labor market increases economic flexibility.

Economic theory.

システムをオープンアーキテクチャとして開放する。

Open the system as an open architecture.

Technical/Business strategy.

閉鎖的なコミュニティを外部に開放する試み。

An attempt to open a closed community to the outside.

Social science context.

情報の非対称性を解消するため、データを開放する。

To resolve information asymmetry, open the data.

Complex logical structure.

文学は、読者の想像力を無限に開放する力を持っている。

Literature has the power to infinitely open up the reader's imagination.

Metaphorical/Literary.

既存のパラダイムを開放し、新たな知の地平を切り拓く。

Open up existing paradigms and forge a new horizon of knowledge.

Highly academic/rhetorical.

権力の独占を排し、意思決定プロセスを市民に開放すべきだ。

Monopoly of power should be rejected, and the decision-making process should be opened to citizens.

Political philosophy.

その建築家は、内と外の境界を開放することを追求した。

The architect pursued the opening of the boundaries between inside and outside.

Artistic/Architectural theory.

教育の門戸を全人類に開放するという崇高な理想。

The noble ideal of opening the gates of education to all humanity.

Idealistic/Formal.

宗教的な教義の枠組みから理性を開放する。

Open up reason from the framework of religious dogma.

Philosophical/Enlightenment theme.

グローバル資本主義における市場開放の是非を問う。

Question the pros and cons of market opening in global capitalism.

Critical analysis.

アーカイブの開放は、歴史の再解釈を可能にする。

The opening of archives enables the reinterpretation of history.

Academic/Historical.

個のアイデンティティを固定的な役割から開放する。

Open up individual identity from fixed roles.

Psychological/Sociological.

近义词

公開開け放つオープン展開開通

反义词

閉鎖封鎖

常见搭配

一般開放

市場開放

開放厳禁

開放感

全面開放

窓の開放

システム開放

心を開放する

校庭開放

段階的開放

常用短语

開放的に振る舞う

— To act in an open, uninhibited, or friendly manner. It suggests a lack of social barriers.

彼は誰に対しても開放的に振る舞う。

情報の開放

— Making information accessible to everyone, often in the context of government or science.

行政は情報の開放を進めている。

施設の無料開放

— Opening a facility for use without any charge. Very common in local news.

今日はプールの無料開放日だ。

窓を全開にする

— To open the windows fully. While 'zenkai' is used, it relates to the state of 'kaihou'.

暑いので窓を全開にして開放した。

規制の開放

— Removing regulations to allow for free activity or trade.

エネルギー市場の規制が開放された。

開放的なデザイン

— A design that feels spacious and lacks restrictive walls.

開放的なデザインのオフィス。

一部開放

— Opening only a portion of a facility or system.

城跡の一部を開放している。

夜間開放

— Opening a facility during the night hours.

展望台の夜間開放が行われる。

会員制の開放

— Opening a membership-only system to the general public.

クラブが一時的に開放された。

データの二次利用への開放

— Opening data for secondary use/reuse by others.

研究データを開放する。

容易混淆的词

開放 vs 解放 (kaihou)

Same pronunciation, but means 'liberation' or 'release from burden'. Context is key.

開放 vs 公開 (koukai)

Means 'making public' (information/media), while 開放 is 'making accessible' (space/system).

開放 vs 開通 (kaitsuu)

Used for the first-time opening of roads or railways.

习语与表达

"門戸を開放する"

— To open the doors (gates) to something; to provide an opportunity for anyone to enter or participate.

大学は留学生に広く門戸を開放している。

Formal

"心を開放する"

— To let go of mental stress or barriers; to be emotionally open.

週末は趣味に没頭して心を開放する。

Neutral

"胸襟を開放する"

— To speak one's mind freely; to be completely open and frank with someone. (Similar to 'opening one's heart').

彼とは胸襟を開放して話し合える仲だ。

Literary

"市場の門戸開放"

— The policy of opening markets to foreign trade (historical/economic term).

門戸開放政策により貿易が盛んになった。

Academic

"五感を開放する"

— To open up all five senses; to fully experience the environment.

森の中で五感を開放する。

Poetic

"知の開放"

— The liberation or opening of knowledge/education to the masses.

インターネットは知の開放をもたらした。

Academic

"自己の開放"

— Self-expression or the act of showing one's true self without restraint.

芸術は自己の開放の一形態である。

Philosophical

"制度の開放"

— Making a rigid system accessible to outsiders or new ideas.

古い制度を開放し、新しい風を入れる。

Formal

"情報の全面開放"

— Total disclosure and accessibility of information.

不祥事を受けて、情報を全面開放した。

Journalistic

"空間の開放"

— The architectural act of creating open, shared spaces.

公共空間の開放が都市を豊かにする。

Formal

容易混淆

開放 vs 解放

Identical pronunciation 'kaihou'.

開放 is 'opening a space'; 解放 is 'setting something free'. You 'kaihou' (開放) a window, but you 'kaihou' (解放) a slave or your own stress.

ストレスから解放される (To be freed from stress).

開放 vs 公開

Both involve 'making something available'.

公開 is about 'seeing/knowing' (e.g., a secret or a movie); 開放 is about 'entering/using' (e.g., a park or a computer system).

情報を公開する (To disclose information).

開放 vs 開店

Both mean 'opening'.

開店 is specifically for a shop starting business for the day or for the first time.

お店が10時に開店する。

開放 vs 開拓

Both involve 'opening' something new.

開拓 means 'pioneering' or 'developing' new land or a new market from scratch.

新市場を開拓する。

開放 vs 開口

Literally means 'opening the mouth'.

Used for physical openings in walls or the act of speaking.

開口一番 (The first thing someone says).

句型

[Noun] を開放してください。

窓を開放してください。

[Noun] は [Time] から開放されます。

校庭は1時から開放されます。

[Noun] を [Target] に開放する予定です。

図書館を一般に開放する予定です。

[Noun] には開放感があります。

この家には開放感があります。

[Noun] の開放は [Result] をもたらす。

市場の開放は競争をもたらす。

[Abstract Noun] を [Source] から開放する。

精神を既成概念から開放する。

词族

名词

開放感 (Sense of openness)

開放性 (Openness/Accessibility)

一般開放 (Public opening)

动词

開放する (To open up)

開放される (To be opened)

形容词

開放的 (Open/Spacious/Frank)

如何使用

frequency

Common in news, signs, and formal requests.

常见错误

Using 開放 for 'opening' a book. → 本を開く (hon o hiraku)
開放 is for spaces and systems, not small physical objects like books or boxes.
Writing 解放 when you mean 'opening a window'. → 窓を開放する
解放 means liberation from suffering or bondage. Writing it for a window would mean 'setting the window free'.
Confusing 開放 with 公開 in information contexts. → 情報を公開する (disclose info)
Use 公開 for showing information; use 開放 for making a system (like an API) accessible for use.
Saying '開放する' for starting a shop. → 開店する (kaiten suru)
開店 is the specific term for starting business hours for a retail store.
Using 開放 for 'opening' a meeting. → 開会する (kaikai suru)
Meetings and ceremonies use 'kaikai', not 'kaihou'.

小贴士

Think 'Accessibility'

Whenever you think about making a place accessible to more people, '開放' is your best choice. It's more than just 'opening'; it's 'welcoming in'.

Learn the 'Release' Kanji

The 'hou' in 'kaihou' (放) means to release. If you remember that you are 'releasing' the gate or 'releasing' the air, the word makes perfect sense.

Complimenting Homes

If you visit a Japanese person's home and it has big windows, say '開放感がありますね！' (It has a great sense of openness!). They will be very happy.

Avoid for Small Objects

Don't 'kaihou' your wallet or your bag. Just 'akeru' them. 'Kaihou' is for big things like parks, buildings, and markets.

Long 'O' Sound

Make sure to stretch the 'ho' sound: kai-hooo. Shortening it makes it sound unfinished or like a different word.

The Passive Form

You will often see '開放されています' on signs. This means 'It is currently in a state of being open to you'.

Kaihou vs Koukai

Remember: Kaihou = Space/System (Access). Koukai = Info/Media (View). You 'kaihou' the gym, you 'koukai' the test results.

Community Spirit

In Japan, 'kaihou' often implies a spirit of sharing. It's a very positive word in a community context.

Market Opening

If you study Japanese history or economics, '市場開放' (shijou kaihou) is a keyword for understanding how Japan interacted with the world.

Ventilation is Key

In modern Japan, 'window opening' (mado no kaihou) is treated as a health necessity. You'll hear this word a lot in office announcements.

记住它

记忆技巧

Think of 'KAI' as a 'KEY' to the 'HOU' (HOUSE). You use the KEY to OPEN the HOUSE to your neighbors.

视觉联想

Visualize a large, heavy gate being pushed open to reveal a bright, sunny park where people are entering freely.

Word Web

Gate Window Market Public Air Accessibility Deregulation Spacious

挑战

Try to find three 'KAIHOU' related signs next time you visit a Japanese public building or school.

词源

The word consists of two kanji: '開' (kai) and '放' (hou). '開' originally depicted two hands pulling back a bar from a gate, signifying 'to open'. '放' consists of '方' (direction) and a radical meaning 'to strike' or 'to act', signifying 'to let go' or 'to release'.

原始含义： To open the gates and let things flow out or in.

Sino-Japanese (Kango).

文化背景

Be careful not to use 'Kaihou' for 'liberating' people from oppression; that requires '解放'.

In English, we might just say 'Open to the public', but 'Kaihou' specifically highlights the act of transitioning from private to public.

Shijou Kaihou (Market Opening) - A major term during the 1980s trade frictions. Koutei Kaihou - A nostalgic term for many Japanese adults remembering playing at school on weekends. Mado no Kaihou - A frequent instruction during the COVID-19 pandemic for ventilation.

在生活中练习

真实语境

Public Parks/Schools

一般開放 (Public opening)
無料開放 (Free opening)
校庭開放 (Schoolyard opening)
開放時間 (Opening hours)

Ventilation/Cleaning

窓の開放 (Opening windows)
ドアを開放する (Open the door)
全開 (Full open)
換気のために開放する (Open for ventilation)

Economics/Business

市場開放 (Market opening)
規制開放 (Deregulatory opening)
資本の開放 (Opening of capital)
門戸開放 (Open door)

Technology

ソースコードの開放 (Opening source code)
API開放 (API opening)
データ開放 (Data opening)
プラットフォームの開放 (Platform opening)

Psychology/Self-help

心を開放する (Open the heart)
感情の開放 (Release of emotions)
自己開放 (Self-opening)
開放的な性格 (Open personality)

对话开场白

"この公園は、いつ一般開放されていますか？ (When is this park open to the public?)"

"最近、市場の開放についてどう思いますか？ (What do you think about the market opening lately?)"

"窓を開放してもいいですか？ (Is it okay if I open the window?)"

"この部屋、すごく開放感がありますね！ (This room has a great sense of openness, doesn't it?)"

"週末に学校の校庭が開放されているのを知っていますか？ (Do you know the schoolyard is open on weekends?)"

日记主题

今日、心を開放するために何をしたか書いてください。 (Write about what you did today to open up your heart.)

あなたの理想の家の「開放感」について説明してください。 (Describe the 'sense of openness' in your ideal home.)

公共の施設をもっと開放すべきだと思いますか？その理由は？ (Do you think public facilities should be opened more? Why?)

「市場開放」が私たちの生活に与える影響について考えてみましょう。 (Think about the impact of 'market opening' on our lives.)

窓を開放して新鮮な空気を吸った時の気持ちを書いてください。 (Write about how you felt when you opened the window and breathed fresh air.)

常见问题

10 个问题

No. For opening presents, boxes, or eyes, you should use '開ける' (akeru). '開放' is specifically for spaces, facilities, or systems. Using '開放' for a gift would sound like you are performing a formal ceremony on a small box.

'開放的' (kaihou-teki) sounds more descriptive and slightly more formal. 'オープン' (o-pun) is a common loanword often used for a shop opening or a person's personality in a casual way. '開放的' focuses on the sense of space and lack of barriers.

No, it means you must not *leave* the door open. You can open it to walk through, but you must close it immediately. It's common on fire doors or in air-conditioned buildings.

Yes, it's very common in tech. You can '開放' an API or '開放' source code, meaning you are making those systems accessible to outside developers.

You have to rely on context. If they are talking about a room, a gate, or a market, they mean 開放 (opening). If they are talking about problems, prisoners, or freedom, they mean 解放 (liberation).

Yes, as '開放的' (kaihou-teki) to describe someone who is open-minded, frank, and easy to talk to. It's a positive personality trait.

It is a common Japanese system where local elementary or junior high schools open their playgrounds to the neighborhood children and residents during weekends or holidays.

It is a 'suru-noun' (verbal noun). You can use it as a noun (開放) or add 'suru' to make it a verb (開放する).

Usually, for launching a website, you use '公開' (koukai). However, if you are opening a previously restricted section of a website to the public, you might use '開放'.

Yes, almost always. It describes a pleasant feeling of having lots of space and light, without feeling trapped or cramped.

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