An association of men belonging to the same class, or engaged in kindred pursuits, formed for mutual aid and protection; a business fraternity or corporation; as, the Stationers' Guild; the Ironmongers' Guild. They were originally licensed by the government, and endowed with special privileges and authority.
- An association of persons of the same trade or pursuits, formed to protect mutual interests and maintain standards.
- A similar association, as of merchants or artisans, in medieval times.
- Ecology A group of diverse species, especially animal species, that occupy a common niche in a given community, characterized by exploitation of environmental resources in the same way.