To rejoice together with someone else; to share in celebrating good news or happiness.
From co- (together) + rejoice, from Old French resjoir, from re- (again) + joir (to enjoy), ultimately from Latin gaudere (to be glad).
Unlike individual joy, corejoicing creates a social bond—when you celebrate with others, your happiness literally gets stronger, which neuroscience shows activates mirror neurons in their brains too.
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