Gre·ga·ri·ous a.  Habitually living or moving in flocks or herds; tending to flock or herd together; not habitually solitary or living alone. --Burke.
     No birds of prey are gregarious.   --Ray.
  -- Gre*ga*ri*ous*ly, adv. -- Gre*ga*ri*ous*ness, n.
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  gregariousness
       n : the quality of being gregarious--having a dislike of being
           alone