This is the 8629th most frequent Japanese word.
敗北
Defeat.
In this sentence, '敗北' is used as a noun meaning 'defeat'.
彼はその試合で敗北を経験しました。
He experienced defeat in that game.
Here, '敗北' is used as a noun indicating the concept of 'defeat' that one should not fear.
敗北を恐れず挑戦することが重要だ。
It is important to challenge without fearing defeat.
In this sentence, '敗北' as a verb-derived noun indicates the state or act of being defeated.