1. A process or procedure that obtains a unique result from any permissible combination of operands.

2. The sequence of actions resulting from the execution of one digital computer instruction.

A job, usually performed in one location, and consisting of one or more work elements.

An operation of a group G on a set S is a mapping which associates to each ordered pair (g,s ), where g is in G and s is in S, another element in S, denoted gs, such that, for any g,h in G and s in S, (gh )s = g(hs ), and es = s, where e is the identity element of G.