fortuitous occurrence
Definitions
An event that happens by chance rather than by design or intent.
A lucky or favorable accident that occurs unexpectedly.
Examples
The meeting of the two long-lost friends at the airport was a truly fortuitous occurrence.
It was a fortuitous occurrence that the rain stopped just as the outdoor wedding ceremony was about to begin.
Synonyms
happy accident serendipitous event lucky break fluke chance happening
Antonyms
planned event calculated outcome foreseen result intentional act deliberate occurrence