define/dIˋfaIn; dIˈfaIn/v [T] 1 to describe something correctly and thoroughly 说明﹐确定﹐界定: We need to define our clients’ needs. 我们要弄清客户的需要。clearly/well defined The aims need to be clearly defined. 目标要定得十分明确。2 to explain the meaning of a word [→ definition] 给〔单词〕下定义: It's difficult to define the word exactly. 这个单词很难下确切的定义。define sth as sth A budget is defined as ‘a plan of action expressed in money terms’. “预算”一词被定义为“以金钱来表述的行动方案”。