Inside
In, Middle, Center
noun
The kanji and the word are exactly the same. That means they share meanings as well.
なか
Since this word is made up of a single kanji, it uses the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
There's a sound coming from inside the wall. It sounds like a knock, knock, knock noise. You break down the wall, and there's some creepy dude standing inside. He is the knocker (なか).
はやく中に入ろう。
Let's go inside quickly.
いえの中は、エアコンがきいていました。
The air conditioning was working well in the house.
そうじきの中はからっぽだった。
The inside of the vacuum cleaner was empty.