Intermediate (B1)
IPA: /kəʊˈɪn.sɪ.dənt.əl/
KK: /kəʊˈɪnsɪdəntəl/
Definition
Happening at the same time by chance, without any planned connection.
Example
It was purely coincidental that we both chose the same restaurant for dinner.
Conversation

It's funny how we both decided to wear blue today, isn't it?

Yeah, it feels a bit coincidental that we matched like this.

I wonder if it means something or if it's just a coincidence.

Probably just a coincidence, but it makes for a fun story!
Synonyms & Antonyms
Synonyms
simultaneous
concurrent
coinciding
Antonyms
unrelated
disparate
incongruous
Root Explanation
Coincidental → It is formed from "co-" (meaning together) and "incidere" (meaning to fall upon or happen). The word describes events that happen together by chance, without any planned connection.
Memory Tip
Think of things happening 'together' ('co-') by 'chance' ('incidere') — that's what coincidental means.
Visually Confused Words
incidental
noncoincidental
unincidental
incoincident
incidentally
confidential
occidental
incidently