The quality of being inevitable or necessary; the state that something must happen rather than by chance.
この決断には一定の必然性があると思う。
I think there is a certain inevitability to this decision.
経済学では、原因と結果の必然性を明らかにしようとする。
In economics, one tries to clarify the necessity/causal relationship between causes and results.
その結論はデータから導かれる必然性を持っている。
That conclusion has an inevitability derived from the data.