国内

§ What 国内 (kokunai) means

Let's talk about the Japanese word 国内 (kokunai). This is a useful term, especially if you're interested in news, business, or travel within Japan. It directly translates to 'domestic' or 'internal'. Think of it as anything happening or existing within the borders of a country, specifically Japan in most contexts when you're using this word in Japanese.

Japanese Word

国内 (kokunai)

Pronunciation

koh-koo-nai

CEFR Level

A2

Definition

Domestic, internal, within the country.

§ How to use 国内 (kokunai) in sentences

You'll often see 国内 (kokunai) paired with other nouns to describe things that are happening inside Japan. It's quite versatile. Here are some common examples:

• 国内旅行 (kokunai ryokō): domestic travel
• 国内線 (kokunai-sen): domestic flight/airline
• 国内市場 (kokunai shijō): domestic market
• 国内生産 (kokunai seisan): domestic production
• 国内問題 (kokunai mondai): domestic issues

Let's look at a few full sentences to get a better feel for it.

Hint

This year, I want to do a lot of domestic travel.

Hint

I booked a domestic flight ticket.

Hint

That product is popular domestically (within the country).

§ Similar words and when to use 国内 (kokunai) vs alternatives

It's common for learners to wonder about similar words. While 国内 (kokunai) is pretty straightforward, let's briefly look at a couple of related terms and why you'd choose 国内 (kokunai).

国中 (kunijū)

国中 (kunijū) means 'all over the country' or 'throughout the country'. While it also refers to being within a country, the nuance is different. 国内 (kokunai) emphasizes the *boundary* or *scope* of being inside the country, whereas 国中 (kunijū) emphasizes the *extent* of something happening or being present *everywhere* within that country.

When to use 国内 (kokunai)

When you want to state that something is happening or exists *within* the country's borders, often in contrast to international or foreign. For example, domestic flights, domestic market, domestic issues.

When to use 国中 (kunijū)

When you want to emphasize that something is widespread or happening *everywhere* within the country. For example, 'The news spread all over the country.'

Hint

That news spread throughout the country.

Here, if you used 国内 (kokunai), it wouldn't sound as natural. 国内 (kokunai) focuses on the domain, 国中 (kunijū) focuses on the reach.

日本国内 (Nihon kokunai)

Sometimes you'll hear 日本国内 (Nihon kokunai). This is simply adding 'Japan' to 国内 (kokunai) for extra clarity. It literally means 'within Japan' or 'domestic to Japan'. You don't always need to add 日本 (Nihon) because context often makes it clear you're talking about Japan, especially if you're already in a conversation about Japan.

When to use 日本国内 (Nihon kokunai)

When you need to explicitly state 'within Japan' to avoid any ambiguity, for example, in official documents, news reports comparing Japan to other countries, or when the conversation might otherwise be unclear about which 'domestic' is being referred to.

Hint

Sales within Japan are strong.

So, to sum it up: Use 国内 (kokunai) for 'domestic' in the sense of 'within the country's boundaries'. Use 国中 (kunijū) for 'all over the country'. And add 日本 (Nihon) to 国内 (kokunai) when you need to be very specific about 'within Japan'. Keep practicing, and you'll get the hang of these nuances!