- The method, act, process, or effect of using a device or system. See military operations, manufacturing operations, anomalous operation.
- In mathematics, a well-defined action that, when applied to any permissible combination of known entities, produces a new entity,
*e.g.*, the process of addition in arithmetic--in adding 5 and 3 to obtain 8, the numbers 5 and 3 are the operands, the number 8 is the result, and the plus sign is the operator indicating that the operation performed is addition. See operator, unary operation, binary operation. - In computer programming, a program step, usually specified by a part of an instruction word, that is undertaken or executed by a computer. Gates such as And, Or and Not are also operations.