/ ˈkɒŋgrɪgeɪt; NAmE ˈkɑːŋ-/ verb
[ v ] to come together in a group :
Young people often congregate in the main square in the evenings.
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WORD ORIGIN
late Middle English : from Latin congregat- collected (into a flock), united, from the verb congregare , from con- together + gregare (from grex , greg- a flock).