1 [C,U] the main meal of the day, eaten either at midday or in the evening 正餐（中午或晚上吃的）: Would you like to go out for / to dinner one evening? 你愿不愿意哪天晚上出去吃晚餐？I never eat a big dinner. 我从来都不吃得过饱。What's for dinner, Mum? 晚饭吃什么，妈妈？

2 [C] a formal occasion in the evening during which a meal is served 宴会；晚宴: The club is holding its annual dinner next week. 俱乐部下周举行一年一度的宴会。