a state of great amusement that makes people laugh 欢闹；狂欢 The announcement was greeted with great hilarity. 宣布的消息很热闹。 Their appearance caused a great deal of hilarity. 他们的出现引起了极大的欢笑。 There was much hilarity when Geoffrey steamed in ten minutes late. 当杰弗里迟到十分钟时蒸熟时，人们欢呼雀跃。
Word Originlate Middle English (in the sense ‘cheerfulness’): from French hilarité, from Latin hilaritas ‘cheerfulness, merriment’, from hilaris, from Greek hilaros ‘cheerful’.