性(せい)

性(せい) is a suffix indicating quality, property, or characteristic (-ness, -ity).

Compounds

Abstract qualities

• 関連(かんれん)性(せい): relevance, relatedness
• 可能(かのう)性(せい): possibility
• 必要(ひつよう)性(せい): necessity
• 重要(じゅうよう)性(せい): importance

Safety/Reliability

• 安全(あんぜん)性(せい): safety
• 信頼(しんらい)性(せい): reliability
• 危険(きけん)性(せい): danger, riskiness

Other common uses

• 独自(どくじ)性(せい): uniqueness
• 創造(そうぞう)性(せい): creativity
• 柔軟(じゅうなん)性(せい): flexibility
• 生産(せいさん)性(せい): productivity

Common patterns

This suffix is highly productive and can be attached to many na-adjectives and nouns to create abstract quality nouns. Similar to English "-ness" or "-ity."