48 C.F.R. § 17.103
As used in this subpart-
Cancellation means the cancellation (within a contractually specified time) of the total requirements of all remaining program years. Cancellation results when the contracting officer
Cancellation ceiling means the maximum cancellation charge that the contractor can receive in the event of cancellation.
Cancellation charge means the amount of unrecovered costs which would have been recouped through amortization over the full term of the contract, including the term canceled.
Multiyear contract means a contract for the purchase of supplies or services for more than 1, but not more than 5, program years. A multiyear contract may provide that performance under the contract during the second and subsequent years of the contract is contingent upon the appropriation of funds, and (if it does so provide) may provide for a cancellation payment to be made to the contractor if appropriations are not made. The key distinguishing difference between multiyear contracts and multiple year contracts is that multiyear contracts, defined in the statutes cited at 17.101, buy more than 1 year's requirement (of a product or service) without establishing and having to exercise an option for each program year after the first.
Nonrecurring costs means those costs which are generally incurred on a one-time basis and include such costs as plant or equipment relocation, plant rearrangement, special tooling and special test equipment, preproduction engineering, initial spoilage and rework, and specialized work force training.
Recurring costs means costs that vary with the quantity being produced, such as labor and materials.
48 C.F.R. §17.103