せい 性 Common word JLPT N3 Wanikani level 14 Show 3 collocations 性が合う - to get along well with性に合う - to be congenial性の解放 - sexual liberation LinksSentence search for 性Sentence search for せいKanji details for 性Edit in JMdict Noun1. nature (of a person)なら習いせい性となる。Habit is second nature.2. sex3. genderSuffix4. -ty; -ity; -ness; -cyindicating quality or condition Discussions Log in to talk about this word.