1. adjective
a) Formed by gathering or collecting; gathered into a mass, sum, or body; congregated or aggregated; as, the collective body of a nation.
Local is his throne . . . to fix a point, A central point, collective of his sons. -Young.
b) Expressing a collection or aggregate of individuals, by a singular form; as, a collective name or noun, like assembly, army, jury, etc.
2. noun
There are, however, a number of contemporary artists and art collectives that have defined their practice precisely around the facilitation of dialogue among diverse communities.
b) A collective noun or name.
Wikipedia foundation.