In mathematics, an action performed on a set of entities that produces a new entity. Examples of mathematical operations are addition and subtraction.
— Computer ScienceA specific action carried out by a computer in the process of executing a program.
— Computer ScienceA request or request-response pairing on a port that is associated with either a send or receive action.
— Computer Science1. A sequence of tactical actions with a common purpose or unifying theme. 2. A military action or the carrying out of a strategic, operational, tactical, service, training, or administrative military mission.
— USA Army