Fortunate chance; a windfall or godsend obtained by luck. Often used in literary or formal contexts.
試験に合格したのは実力というより僥倖だったと彼は言った。
He said that passing the exam was more a matter of luck than ability.
事故に遭わず無事だったのは僥倖だった。
It was a stroke of luck that he escaped the accident unharmed.