WordReference Random House Learner's Dictionary of American English © 2025
co•in•ci•den•tal /ˌkoʊɪnsəˈdɛntəl/USA pronunciation adj.
WordReference Random House Unabridged Dictionary of American English © 2025- happening by coincidence:Our meeting was coincidental; no one planned it.
co•in•ci•den•tal
(kō in′si den′tl),USA pronunciation adj.
co•in′ci•den′tal•ly, co•in•ci•dent•ly
(kō in′si dənt lē),USA pronunciation adv.
- happening by or resulting from coincidence; by chance:a coincidental meeting.
- existing or occurring at the same time.
- coincident + -al1 1790–1800
'coincidently' also found in these entries (note: many are not synonyms or translations):