Spirit
Energy
noun
The kanji and the word are exactly the same. That means they share meanings as well.
き
The reading is the same as the kanji that makes up this word. Lucky you!
かのじょはとつぜん、気をうしなった。
She suddenly lost consciousness.
気をつけてかえってきてね。
Please come back safe.
おまえ、気は確かか？
Are you out of your mind?