[countable, uncountable] the fact of two things happening at the same time by chance, in a surprising way. a strange/an extraordinary/a remarkable ...

the fact of two things happening at the same time by chance, in a surprising way; a strange/an extraordinary/a remarkable coincidence.

There are ten meanings listed in OED's entry for the noun coincidence, one of which is labelled obsolete. See 'Meaning & use' for definitions, usage, and ...

coincide ; 1 · of two or more events · to take place at the same time ; 2 · of ideas, opinions, etc. · to be the same or very similar ; 3 · of objects or places · to ...

​coincident (with something) happening in the same place or at the same time. Word Originmid 16th cent.: from medieval Latin coincident- 'coinciding', ...

[intransitive] (formal) (of ideas, opinions, etc.) to be the same or very similar. Extra Examples Our views on this issue coincide closely with yours.

7 дней назад · an occasion when two or more similar things happen at the same time, especially in a way that is unlikely and surprising.

coincident adjective NAmE//koʊˈɪnsədənt// coincident (with something) (formal) happening in the same place or at the same time.

The Oxford Dictionary of Proverbs (5 ed.) Edited by: John Simpson and Jennifer Speake. Publisher: Oxford University Press.

happening by chance; not planned; I suppose your presence here today is not entirely coincidental. It's purely coincidental that we both chose to name our ...