Spirit
Energy
noun
The kanji and the word are exactly the same. That means they share meanings as well.
The reading is the same as the kanji that makes up this word. Lucky you!
その少年は気がつよい。
The boy is strong-willed.
今日のフライトも、気をつけてね。
Take care on today's flight, too.
気がついたら一人で川にいたんです。
I found myself alone in the river.