To come together in a group or crowd, often for a particular purpose.
From Latin *congregare*, meaning "to gather into a flock" (*con-* "together" + *grex, greg-* "flock, herd"). It originally described animals gathering together.
When people congregate, they’re basically acting like a human flock. That same *greg-* root shows up in "gregarious"—people who love being in the herd.
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