re ‧ u ‧ nion /riːˈjuːnjən/ BrE AmE noun
1 . [countable] a social meeting of people who have not met for a long time, especially people who were at school or college together:
an annual reunion
a family reunion
a high-school reunion
2 . [uncountable] when people are brought together again after a period of being separated
reunion with
Joseph’s eventual reunion with his brother