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gregarious (adj.)

1660s, "disposed to live in flocks" (of animals), from Latin gregarius "pertaining to a flock; of the herd, of the common sort, common," from grex (genitive gregis) "flock, herd," from PIE *gre-g-, reduplicated form of root *ger- "to gather." Of persons, "sociable," first recorded 1789. Related: Gregariously; gregariousness.