noun
contingency; fortuity; randomness
Abstract noun referring to the quality of being accidental, unpredictable, or dependent on chance. Often used in philosophical or analytical contexts.
歴史の偶然性について議論する。
We discuss the contingency of history.
この実験では偶然性を排除
In this experiment, we need to eliminate randomness.
必然性 is the antonym, meaning 'necessity' or 'inevitability', the quality of being unavoidable.
Compound of 偶然 (accidental, by chance) + 性 (-ness, property). The exact historical derivation is uncertain, but the word follows a common pattern for forming abstract nouns.