From the Latin word grex, gregis (stem greg), meaning "a flock of herd animals," a gregarious individual is outgoing and loves to be part of a big flock. In fact, we find the stem greg in similar "flock"-related words as well. If the “flock” (greg) comes “together” (con), you get a con-greg-ation. If the flock splits “apart” (se), we call that se-greg-ation. And if you do something especially good or especially bad—something that stands “out” (e, ex) from the rest of the flock—that is called e-greg-ious behavior.