Pronunciation: (kō-op'u-rāt"), [key]
—v.i., -at•ed, -at•ing.
1. to work or act together or jointly for a common purpose or benefit.
2. to work or act with another or other persons willingly and agreeably.
3. to practice economic cooperation. Also,co-op'er•ate".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.