gaiety
/ˈgeɪətɪ/( <美> 亦作gayety)
noun
(pl. -ies)［mass noun］
1- the state or quality of being light-hearted or cheerful欢乐, 高兴：
the sudden gaiety of children's laughter.
孩子们突然迸发出的快乐的笑声。
1.1
- merrymaking or festivity玩乐; 欢庆; 庆祝活动：
he seemed to be a part of the gaiety, having a wonderful time.
他似乎已融入到庆祝活动中, 玩得高兴极了。
1.2
gaieties
dated entertainments or amusements〈旧〉娱乐表演; 娱乐活动。
词源
mid 17th cent.: from French gaieté, from gai （see GAY）.