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say it: HAP-uhn-stans
happenstance is a noun meaning "an event that might have been arranged although it was really accidental". It carries one recorded sense.
an event that might have been arranged although it was really accidental
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for happenstance come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.