noun

1. A unit of a housing co-operative; a purchased apartment where the apartment owners collectively are responsible for maintenance of common areas and upkeep.

2. Any co-operative, including housing, retail, utility, agricultural, banking or worker cooperatives.

3. Any shop owned by a co-operative.

verb

1. To work or act together, especially for a common purpose or benefit.

2. To allow for mutual unobstructed action

3. To function in harmony, side by side

Synonyms: co-op, coact, make common cause