Dictionary of Business Terms: commercial unit
commercial unit
a unit considered by trade or usage to be a whole that cannot be divided without materially impairing its value, character, or use, such as a machine or a suite of furniture. Since acceptance of any part of a commercial unit constitutes acceptance of the whole, the term becomes significant when a buyer attempts to reject part of a contract for nonconformance. If the item rejected is part of a commercial unit, the rejection will not be allowed.