semiformal /ˌsɛmiˈfoɚməl/ adjective Learner's definition of SEMIFORMAL
US
: somewhat formal : not informal but not highly formal半正式的 -
She wore a semiformal gown to the wedding.她穿了一件半正式礼服去参加婚礼。
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a semiformal dinner party半正式宴会
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a semiformal meeting/proposal半正式会议/提议