- 1[countable] 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
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- 2[countable, uncountable] reunion (with somebody) 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[uncountable] the action of becoming a single group or organization again Some have advocated the reunion of the Church of England with the Church of Rome.
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