1. 爱交际的；合群的
Someone who is gregarious enjoys being with other people.

2. （动物、鸟等）群居的
Gregarious animals or birds normally live in large groups.

1. instinctively or temperamentally seeking and enjoying the company of others

e.g. he is a gregarious person who avoids solitude

2. (of animals) tending to form a group with others of the same species

e.g. gregarious bird species

3. (of plants) growing in groups that are close together