/ˈju:nɪfɔ:m ||; ˈjunəˌfɔrm/noun [C,U] the set of clothes worn at work by the members of certain organizations or groups and by some schoolchildren 制服；校服: I didn't know he was a policeman because he wasn't in uniform. 我不知道他是警察，因为他当时没穿制服。 ➔uniformed adj