fortuity

noun

anything that happens suddenly or by chance without an apparent cause
はっきりした原因もなく突然または偶然起こること
- winning the lottery was a happy accident
  宝くじに当たることはうれしい出来事であった
- the pregnancy was a stroke of bad luck
  妊娠は運の悪い出来事であった
- it was due to an accident or fortuity
  それは事故か偶然が原因だった

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