Definition of it (just) so happens that
- It (just) so happens that I know her son.
: having a basis in or conforming to fact or reason : reasonable
: conforming to a standard of correctness : proper
: faithful to an original
: exactly, precisely
: very recently
: by a very small margin : barely
: archaic variant of joust
: to occur by chance
: to come into being or occur as an event, process, or result
: to do, encounter, or attain something by or as if by chance
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