gre·gar·i·ous 
(grĭ-gârē-əs)
(grĭ-gârē-əs)adj.
1. Seeking and enjoying the company of others; sociable. See Synonyms at social.
2. Tending to move in or form a group with others of the same kind: gregarious bird species.
3. Botany Growing in groups that are close together but not densely clustered or matted.
[Latin gregārius, belonging to a flock, from grex, greg-, flock; see ger- in the Appendix of Indo-European roots.]
gre·gari·ous·ly adv.
gre·gari·ous·ness n.