n. A relationship between two companies that involves both co-operation and competition.

Example Citation:
"The news that giant Microsoft Corp. had invested $150-million (U.S.) in bitter arch-rival Apple Computer Inc. shook the computer universe yesterday with the force of planets colliding...'It's happening more and more that companies compete in one segment and co-operate in another.'...There even a name for it: co-opetition."
—Gayle MacDonald