gregarious
Pronunciation: /grɪˈgɛːrɪəs/
adjective
- (of a person) fond of company; sociable: he was a popular and gregarious man
- (of animals) living in flocks or loosely organized communities: gregarious species forage in flocks from colonies or roosts
- (of plants) growing in open clusters or in pure associations: in the wild, trees are usually gregarious plants

Origin:
mid 17th century: from Latin gregarius (from grex, greg- 'a flock') + -ous