coincidental

1 existing or occurring at the same period of time the nearly coincidental deaths of Princess Diana and Mother Teresa Synonyms of coincidental coetaneous, coeval, coexistent, coexisting, coextensive, coincident, contemporary, concurrent, contemporaneous, coterminous, simultaneous, synchronic, synchronousWords Related to coincidental accompanying, attendant, attending, concomitant, incidentAntonyms of coincidental asynchronous, noncontemporary, nonsimultaneous, nonsynchronous

2 present at the same time and place claims a connection between the proliferation of fast-food restaurants and the coincidental surge in the rate of obesity Synonyms of coincidental accompanying, attendant, attending, coexistent, coexisting, coincident, concomitant, concurrentWords Related to coincidental contemporaneous, contemporary, simultaneous, synchronous; associated, collateral, connected, linked, related; consequent, resultant, resulting; ensuing, following, subsequent; accidental, casual, chance, fluky (also flukey), fortuitous, freak, incident, incidentalNear Antonyms of coincidental unassociated, unconnected, unrelated