せいしき 正式 Common word JLPT N3 LinksSentence search for 正式Sentence search for せいしきKanji details for 正 and 式Edit in JMdict Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Noun1. formal; official; regular; proper; legal; due (formalities) Discussions Log in to talk about this word.