鍵
Kana: かぎ
key
Example sentence
部屋の鍵をなくしました。
へやのかぎをなくしました。
I lost the room key.
What 鍵 means
鍵 (かぎ) is a Japanese word meaning “key”. It belongs to the Things & Objects topic and appears at Level 2 (and again in Level 4), so it is one of the words worth learning early when you study Japanese.