noun
nature; character; disposition
Refers to a person's innate character or temperament. Often used in fixed expressions like 性に合う (suits one's nature).
彼は性に合わない仕事を辞めた。
He quit the job that didn't suit his nature.
Covers biological sex, gender identity, and sexual activity/attraction. Context distinguishes the specific meaning.
応募書類に性を記入してください。
Please fill in your sex on the application form.
性についての教育は重要だ。
Education about sex is important.
noun
Grammatical gender, as in masculine, feminine, or neuter. Technical use in linguistics.
ドイツ語の名詞には性がある。
German nouns have grammatical gender.
noun, used as a suffix
-ty; -ity; -ness; -cy
Suffix indicating a quality or condition. Attaches to nouns or adjectival stems to form abstract nouns, e.g., 可能性 (possibility), 安全性 (safety).
この製品の安全性は確認済みです。
The safety of this product has been confirmed.
彼の可能性を信じている。
I believe in his potential.