semiformal
sem i for mal |ˌsemēˈfôrməl, ˌsemˌī -ˌsɛmiˈfɔrməl | ▶adjective combining formal and informal elements: in the semiformal atmosphere irritations can be aired. • used to describe clothing that is neither formal nor casual and that is typically worn for a dance, wedding, or other event: the casino has a semiformal dress code (men must wear a tie and jacket ). ▶noun an event at which semiformal attire is expected: it had organized its own spring semiformal at a nearby hotel.
s è mi f ó rmal 形容詞 やや格式ばった, 準正式の .