cooperative

The definition of cooperative is someone who is willing to work with others nicely, or is working together towards achieving a common goal.

(adjective)

An easy-going person who does what you need and pitches in is an example of someone who is cooperative.
When two people work together to achieve something, this is an example of a cooperative effort.

See cooperative in Webster's New World College Dictionary

adjective

cooperating or inclined to cooperate
designating or of an organization (as for the production or marketing of goods), an apartment house, store, etc. owned by and operated for the benefit of members who use its facilities or services

noun

a cooperative society, store, etc.

Also

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See cooperative in American Heritage Dictionary 4

adjective

Done in cooperation with others: a cooperative effort.
Marked by willingness to cooperate; compliant: a cooperative patient.
Of, relating to, or formed as an enterprise or organization jointly owned or managed by those who use its facilities or services: a cooperative department store; cooperative apartment buildings.

noun

An enterprise or organization that is owned or managed jointly by those who use its facilities or services.

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