/ riːˈjuːniən; NAmE / noun
1.
[ C ] a social occasion or party attended by a group of people who have not seen each other for a long time :
a family reunion
the school's annual reunion
a reunion of the class of '85
2.
[ C , U ] reunion (with sb) | reunion (between A and B) the act of people coming together after they have been apart for some time :
an emotional reunion between mother and son
Christmas is a time of reunion.
3.
[ U ] the action of becoming a single group or organization again :
the reunion of the Church of England with the Church of Rome
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WORD ORIGIN
early 17th cent.: from French réunion or Anglo-Latin reunio(n-) , from Latin reunire unite.