portion/ˋpɔrʃən; ˈpɔːʃ$n/n [C] 1 a part of something〔某物的〕一部分: +of The return portion of the plane ticket can be used at any time. 这机票的回程部分可以在任何时候使用。large/substantial/significant portion A large portion of the money has been spent on advertising. 这笔钱有很大一部分用在做广告上了。2 an amount of food for one person〔供一人吃的食物的〕一份﹐一客: +of a small portion of ice cream 一小份冰激凌