noun
Formal, academic term for probability or likelihood. Often used in philosophical or statistical contexts. Not common in everyday conversation.
その理論の蓋然性は高いと評価された。
The probability of that theory was evaluated as high.
蓋然性の概念は統計学の基礎である。
The concept of probability is fundamental to statistics.
Compound of 蓋 (cover, lid; also used in the sense of 'probably') and 然 (state, condition). The combination conveys the idea of a state that is likely or probable.