必然性|ひつぜんせいhitsuzensei

1. nounnecessity; inevitability

• Related不可避ふかひWrittenRefers to what cannot be avoided. 「必然性」 is the abstract noun for the quality of being bound to be so, or for necessity.
• Related必至ひっしWrittenRefers to something certain to come about, as in 「混乱は必至」; 「必然性」 is an abstract noun.
• Antonym偶然性ぐうぜんせいWrittenThe opposite of 「必然性」: what happens by chance and cannot be predicted.
• Antonym蓋然性がいぜんせいWrittenRefers to how probable something is; often contrasted with 「必然性」, which means something is certain to be so.

Use 「必然性」 for what is bound to be so — an abstract noun for inevitability or necessity. For what cannot be avoided, use 「不可避」 or 「必至」; for likelihood, 「蓋然性」; for chance, 「偶然性」. All are written-register terms.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. そうならざるをえない状態じょうたいや、どうしても必要ひつような事柄ことがら。