from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. (computing) Describing an action which, when performed multiple times, has no further effect on its subject after the first time it is performed.
- adj. Said of an element of an algebraic structure (such as a group or semigroup) with a binary operation: that when the element operates on itself, the result is equal to itself.
- adj. Said of a binary operation: that all of the distinct elements it can operate on are idempotent (in the sense given just above).
- n. An idempotent ring or other structure
from The Century Dictionary and Cyclopedia
- n. In multiple algebra, a quantity which multiplied into itself gives itself. Ordinary unity is idempotent.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. unchanged in value following multiplication by itself
Latin roots, idem (“same”) + potent (“having power”) – literally, “having the same power”. (Wiktionary)