1
- as exclamation Brit. informal, dated a call for a truce, used especially by schoolchildren when playing〈英, 非正式, 旧〉（尤指学童玩耍时用的）停止！别打了！别吵了！：
Pax! No offence meant, honest old chum.
别吵了！我们不想冒犯你, 诚实的老朋友。
2
- chiefly historical (in the Christian Church) the kissing by all the participants at a mass of a tablet depicting the Crucifixion or other sacred object; the kiss of peace〈主史〉【基督教】（大弥撒中的）接吻礼。
词源
Latin, literally 'peace'.