This definition appears very rarely
Samples in periodicals archive:
Recommended Practice: Evaluating Commercial Off-the-Shelf (COTS) Electronic Records Management (ERM) Applications
Abstract. This article addresses criteria for choosing commercial off-the-shelf (COTS) games and their implementation in the classroom and other L2 learning environments.
The Host Based Security System (HBSS) is the official name given to the Department of Defense (DOD) commercial-off-the-shelf (COTS) suite of software applications...