せい 正 Common word JLPT N3 Show 2 collocations 正と反 - thesis and antithesis正と続 - first and second series LinksSentence search for 正Sentence search for せいKanji details for 正Edit in JMdict Noun, Noun which may take the genitive case particle 'no'1. (logical) true; regularNumeric2. 10^40; ten thousand undecillionNoun, Noun which may take the genitive case particle 'no'3. originalAbbreviation, See also 正本 せいほんNoun, Noun which may take the genitive case particle 'no'4. positive; greater than zeroMathematics, See also 負 ふNoun5. thesis (in dialectics)Philosophy, See also 定立, See also 正反合 Discussions Log in to talk about this word.