plural of operational service period

(US) A small business that produces homemade foods and is partially exempt from the regulations governing larger commercial food operations.

plural of cottage food operation

plural of operational taxonomic unit

(informal) A covert or clandestine entry into a building etc. to obtain information for an intelligence operation.

plural of black bag operation

plural of floating-point operation

Alternative form of floating point operation

(rail transport) The operation of a train without a conductor or guard as a cost-cutting measure; one-man operation.

(euphemistic) A military situation resembling a war (usually referencing the events of February 2022 in the Russo-Ukrainian War)