せいとうせい 正当性 LinksSentence search for 正当性Sentence search for せいとうせいKanji details for 正, 当 and 性Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. lawfulness; propriety; reasonableness; appropriateness; legality; legitimacy; justifiability; validity Discussions Log in to talk about this word.