envelope
An envelope is a flat paper cover used to hold a letter or card for mailing.
Explanation at your level:
An envelope is a paper bag for letters. You put your letter in the envelope. Then you close the flap. You write the address on the front. Now you can mail it!
You use an envelope to send a card or a letter. It is usually white. You put the paper inside and seal it. You need a stamp on the envelope to send it in the mail.
An envelope is a flat paper container used to protect documents. In business, you often use a 'window envelope' so the address shows through. Remember to 'seal' the envelope before you drop it in the mailbox.
Beyond its literal meaning, the term envelope is used in the idiom 'push the envelope,' meaning to innovate or exceed current standards. In technical fields, it can refer to the operational limits of an aircraft or machine.
The term envelope functions as both a physical object and a metaphorical boundary. In mathematics and engineering, an 'envelope' describes a curve that is tangent to a family of curves. It represents the outer limit or the 'boundary' of a system's performance.
Etymologically, the envelope represents the concept of 'envelopment' or 'encapsulation.' In literary contexts, it may symbolize secrecy or containment. Whether discussing the 'envelope of the atmosphere' or the 'envelope of a function,' the word consistently denotes an encompassing layer that defines the scope of the object within.
30秒でわかる単語
- An envelope is a paper container for mail.
- It has a flap you seal.
- The verb form is 'envelop'.
- It is also used metaphorically as 'push the envelope'.
Think of an envelope as a protective suit for your mail! It is a simple yet essential tool we use to keep our letters, birthday cards, and important documents safe and private while they travel through the postal system.
Most envelopes are made of paper and come in a standard rectangular shape. You insert your paper, fold the flap down, and use a bit of glue or a sticker to keep it shut. It is a fundamental object in daily life, even in our digital world.
The word envelope comes from the French verb envelopper, which means 'to wrap up' or 'to cover.' It entered the English language in the 17th century, originally referring to a wrapper or a covering of any kind.
Before the 1840s, envelopes were actually quite rare and expensive because they were handmade. Most people just folded their letters and sealed them with wax. When the Uniform Penny Post was introduced in Britain in 1840, sending mail became cheap and popular, leading to the mass production of the paper envelopes we know today.
You will use the word envelope whenever you are talking about sending mail or organizing documents. Common collocations include 'seal an envelope,' 'address an envelope,' and 'a stamped envelope.'
In a formal office setting, you might refer to a 'manila envelope' for large documents. In casual conversation, you might simply say, 'I need to find an envelope for this card.' It is a very neutral term used by everyone from toddlers to CEOs.
1. Push the envelope: To approach or extend the limits of what is possible. Example: The new design really pushes the envelope of modern architecture.
2. Envelope of air: A layer of air surrounding an object or planet. Example: The Earth is protected by an envelope of air.
3. Brown envelope: Often refers to an illicit bribe or secret payment. Example: The scandal was uncovered when they found the brown envelope.
4. Seal the envelope: To finalize an agreement. Example: Let's shake hands and seal the envelope on this deal.
5. Return envelope: A pre-addressed envelope included for a reply. Example: Please use the enclosed return envelope to send back the form.
The noun envelope is countable, so you can have 'one envelope' or 'many envelopes.' The stress usually falls on the first syllable: EN-vuh-lope.
Interestingly, some people pronounce it with a French-style 'on' sound (ON-vuh-lope), which is common in both British and American English. It rhymes with 'develop' (in some dialects) or 'cantaloupe.' Always use the indefinite article 'an' before it, as it starts with a vowel sound.
Fun Fact
Before envelopes, letters were folded and sealed with wax.
Pronunciation Guide
Starts with a clear 'en' sound.
Often sounds like 'on-vuh-lope'.
Common Errors
- Pronouncing the 'v' as 'f'
- Swallowing the 'lope' sound
- Forgetting the stress on the first syllable
Rhymes With
Difficulty Rating
Very common word.
Simple spelling.
Easy to pronounce.
Clear sounds.
What to Learn Next
Prerequisites
Learn Next
上級
Grammar to Know
Articles with nouns
an envelope
Countable nouns
one envelope, two envelopes
Verb vs Noun stress
EN-velope vs en-VEL-op
Examples by Level
I put the letter in the envelope.
put = place, letter = paper message
Use 'in' for containers.
Do you have an envelope?
have = possess
Use 'an' before vowel sounds.
The envelope is white.
white = color
Adjective placement.
I need a pen and an envelope.
need = require
Conjunction 'and'.
Seal the envelope, please.
seal = close
Imperative verb.
Where is my envelope?
where = location
Question word.
This is a big envelope.
big = large
Adjective size.
Open the envelope.
open = reveal
Direct command.
Please address the envelope clearly.
I bought a pack of envelopes.
The envelope was empty.
Can you lick the envelope flap?
I lost the envelope with the money.
Put the stamp on the top right of the envelope.
The envelope arrived in the mail today.
She tore open the envelope excitedly.
The documents were sent in a large manila envelope.
Don't forget to seal the envelope before mailing it.
He slipped a note into the envelope.
Please include a self-addressed stamped envelope.
The envelope contained a confidential report.
I couldn't find an envelope that fit the card.
The company sent the invoice in a window envelope.
She checked the envelope for a return address.
The engineers are trying to push the performance envelope of the new engine.
The envelope of the storm is moving toward the coast.
He handed her a plain white envelope across the table.
The project is really pushing the envelope of current technology.
The data falls well within the expected envelope.
She carefully slit the envelope open with a letter opener.
The envelope of the atmosphere protects us from radiation.
There was a thick envelope waiting for him on the desk.
The mathematical envelope of the family of curves is a parabola.
The pilot had to stay within the flight envelope to maintain control.
The political scandal involved a brown envelope exchange.
His artistic style really pushes the envelope of traditional painting.
The envelope of the virus protects its genetic material.
The budget envelope was strictly limited this year.
She felt as though she were trapped within an envelope of silence.
The envelope of the sound wave changed as it hit the wall.
The envelope of the function defines the maximum possible values.
The historical envelope of the Renaissance period is debated by scholars.
He operated at the very edge of the envelope of human endurance.
The envelope of the star's radiation is visible through the telescope.
The social envelope in which they lived was very restrictive.
The envelope of the building's design creates a unique microclimate.
The envelope of the poem's structure mirrors its theme.
He pushed the envelope of his own morality during the crisis.
よく使う組み合わせ
Idioms & Expressions
"push the envelope"
to exceed limits
They are pushing the envelope with this new car.
neutral"a brown envelope"
a bribe
He was caught taking a brown envelope.
informal"seal the envelope"
to finalize
Let's seal the envelope on this deal.
casual"envelope of air"
atmosphere
We live in an envelope of air.
scientific"return envelope"
reply container
Don't forget the return envelope.
neutral"the envelope is pushed"
limits are tested
The envelope is pushed every day.
neutralEasily Confused
similar spelling
verb vs noun
The fog will envelop (verb) the city; put it in an envelope (noun).
both are containers
package is for items, envelope for paper
I sent a package (box) and an envelope (letter).
both cover things
wrapper is for food/items, envelope for mail
Candy wrapper vs letter envelope.
both hold paper
folder is for storage, envelope for mailing
File folder vs mailing envelope.
Sentence Patterns
Subject + put + object + in + envelope
I put the letter in the envelope.
Verb + the + envelope
Seal the envelope.
Adjective + envelope
It is a large envelope.
Push + the + envelope
We need to push the envelope.
The + envelope + contains + object
The envelope contains a check.
語族
Nouns
Verbs
Adjectives
関連
How to Use It
8
Formality Scale
よくある間違い
Envelope is the noun; envelop is the verb.
People often write 'envelop' for the noun.
It is not 'AN-vuh-lope' in standard US English.
Starts with a vowel sound.
Envelop (no 'e' at end) means to surround.
Tips
Memory Palace Trick
Imagine a giant envelope walking into your front door.
When Native Speakers Use It
When talking about mail or limits.
Cultural Insight
The Oscars use envelopes to announce winners.
Grammar Shortcut
Noun = envelope, Verb = envelop.
Say It Right
Stress the first syllable.
Don't Make This Mistake
Don't write 'envelop' for the object.
Did You Know?
Envelopes were once handmade.
Study Smart
Practice using the idiom 'push the envelope' in a sentence.
Writing Tip
Always capitalize the address on an envelope.
Word Family
Link envelope to envelop.
Memorize It
Mnemonic
En-velope: ENter the VElope (a made-up word for a paper cave).
Visual Association
A white rectangle with a stamp.
Word Web
チャレンジ
Address an envelope to yourself today.
語源
French
Original meaning: to wrap up
文化的な背景
None, but 'brown envelope' implies corruption.
Commonly used in offices and for personal mail.
Practice in Real Life
Real-World Contexts
at the post office
- Do you have envelopes?
- How much for this envelope?
at work
- Please seal the envelope.
- Where are the manila envelopes?
at home
- I need an envelope for this card.
in business
- The contract is in the envelope.
Conversation Starters
"Do you still send letters in envelopes?"
"What is the most important thing you've ever received in an envelope?"
"Have you ever heard the idiom 'push the envelope'?"
"Do you prefer digital mail or physical envelopes?"
"What kind of envelopes do you keep at home?"
Journal Prompts
Write about the last time you received a letter in an envelope.
Describe the process of preparing a letter for the mail.
What does 'pushing the envelope' mean to you in your career?
Why do you think physical mail is still important?
よくある質問
8 問Envelope is the noun; envelop is the verb.
EN-vuh-lope.
No, use 'envelop'.
An envelope with a clear plastic window.
From the French word for 'to wrap'.
Yes, from small cards to large manila ones.
Yes, for mailing letters.
To exceed limits.
自分をテスト
Put the letter in the ___.
An envelope holds a letter.
What do you do to an envelope before mailing it?
You must seal it so the letter doesn't fall out.
An envelope is a verb.
Envelope is a noun. Envelop is the verb.
Word
意味
These are common actions with envelopes.
Subject + verb + object.
The pilot pushed the ___ of the aircraft.
Idiomatic usage.
What is a 'brown envelope' often associated with?
Cultural idiom for corruption.
You should put a stamp on the envelope.
Stamps are required for mail.
Word
意味
Technical definitions.
Standard sentence structure.
スコア： /10
Summary
An envelope is a simple paper tool for mailing letters, but it also represents the limit of what is possible.
- An envelope is a paper container for mail.
- It has a flap you seal.
- The verb form is 'envelop'.
- It is also used metaphorically as 'push the envelope'.
Memory Palace Trick
Imagine a giant envelope walking into your front door.
When Native Speakers Use It
When talking about mail or limits.
Cultural Insight
The Oscars use envelopes to announce winners.
Grammar Shortcut
Noun = envelope, Verb = envelop.
例文
She sealed the envelope.
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