正式せいしき Common I-adj Noun Noun English jmdict 1 adjectival nouns or quasi-adjectives (keiyodoshi)nouns which may take the genitive case particle 'no'noun (common) (futsuumeishi) formal;official;regular;proper;legal;due (formalities) 彼女の服装は正式なパーティーでは場違いだった。 Her clothes were out of place at a formal party.