(set theory) A mathematical operation that returns a set taking one or more sets as input.

(algebra) An operation taking one operand, such as the square, factorial or absolute value operation.

(algebra, computing) A symbol representing binary operation; an operator taking two operands.

(law) An application of a legal rule that automatically brings about a legal consequence.

Alternative spelling of postoperative

Alternative spelling of cooperation

A description, usually graphical, showing the major participants or components in a system and their interrelationships.

A showing of something — such as a variable, term, or object — in terms of the specific process or set of validation tests used to determine its presence and quantity.

(dated) A person who operates a radio transmitter on a ship or in an outpost, military unit, etc., in order to communicate over long distances.

plural of multiplicative operation