Ambition
Aspiration, Spirit
noun
If you have the leadership spirit it means you have a lot of ambition to go after the things you want. And you'll be able to lead others because of it.
はき
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
うちの息子は、若いのに覇気が無い。
Despite his youth, my son lacks ambition.