キー

きー
noun
key
1. key (physical or digital)
A key for a lock, a keyboard key, or a key element/factor.
キーを(まわ)す。
I turn the key.
キーボードのキーが(こわ)れた。
A key on the keyboard broke.
この問題(もんだい)解決(かいけつ)するキーパーソンは(かれ)だと(おも)う。
I think he's the key person to solve this problem.

キー comes from English "key" and is used in multiple contexts.

COMMON COMPOUNDS:

  • キーボード: keyboard
  • キーワード: keyword
  • キーパーソン: key person
  • キーポイント: key point
  • キーホルダー: keychain (Japanese coinage)
  • マスターキー: master key
  • カーキー: car key

SIMILAR WORDS:

  • (かぎ): key (native Japanese word, used for physical keys and locks)
  • キー is more commonly used in compounds and technical contexts, while (かぎ) is the everyday word for physical keys.

NOTE:
キーホルダー (key holder) is a Japanese-English coinage meaning "keychain." In English, a "key holder" usually means a wall-mounted rack for keys.