/ˌprepəˈzɪʃn ||; ˌprɛpəˈzɪʃən/noun [C] (grammar语法) a word or phrase that is used before a noun or pronoun to show place, time, direction, etc 介词（用于名词或代名词前的单词或词组，表示地方、时间、方向等）: ‘In’, ‘for’, ‘to’ and ‘out of’ are all prepositions. in、for、to和out of都是介词。