[] to say or explain what the meaning of a word or phrase is下定义◆The Act defines ‘small companies’ as firms with fewer than 25 employees.这法案将“小企业”定义为员工少于 25 人的企业。to describe sth accurately阐明；明确；界定◆They define success in terms of financial gain.他们界定成功的标准是经济收益。◆A project needs to have clearly defined objectives.一个项目必须有清晰界定的目标。▸definition /ˌdefɪˈnɪʃn/