Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun happenstance
1 sense of happenstance
Sense 1
coincidence, happenstance -- (an event that might have been arranged although it was really accidental)
=> accident, stroke, fortuity, chance event -- (anything that happens suddenly or by chance without an apparent cause; "winning the lottery was a happy accident"; "the pregnancy was a stroke of bad luck"; "it was due to an accident or fortuity")