▪ (of animals) living in flocks or loosely organized communities: "gregarious species forage in flocks from colonies or roosts"Similarsocialorganizedliving in shoals/flocks/herds
▪ (of plants) growing in open clusters or in pure associations:"in the wild, trees are usually gregarious plants"
Word Originmid 17th century: from Latin gregarius (from grex, greg- ‘a flock’) + -ous.