Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. A complete change; a transformation.
 n. The act of altering a given set of objects in a group.
 n. Mathematics A rearrangement of the elements of a set.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A onetoone mapping from a finite set to itself.
 n. An ordering of a finite set of distinct elements.
 n. A transformation of a set's prime form, by applying one or more of certain operations, specifically, transposition, inversion, and retrograde.
from the GNU version of the Collaborative International Dictionary of English
 n. The act of permuting; exchange of the thing for another; mutual transference; interchange.
 n.
 n. The arrangement of any determinate number of things, as units, objects, letters, etc., in all possible orders, one after the other;  called also alternation. Cf. Combination, n., 4.
 n. Any one of such possible arrangements.
 n. Barter; exchange.
from The Century Dictionary and Cyclopedia
 n. Interchange; concurrent changes; mutual change; change in general.
 n. Exchange; barter.
 n. In mathematics, a linear arrangement of objects resulting from a change of their order.
 n. In philology, the mutation or interchange of consonants, especially of allied consonants.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. the act of changing the arrangement of a given number of elements
 n. act of changing the lineal order of objects in a group
 n. an event in which one thing is substituted for another
 n. complete change in character or condition
Etymologies
Examples

The only factual effect of the current system or any permutation is creating the illusion of security.

Mr. MAHANTHAPPA: And I think this  the idea of permutation is something that I've always gravitated towards.

The alternative is to provide a variation on every word in the word censor with every possible punctuation permutation, which is not feasible.

The chief guideline that governed the permutation was the desire to create visual drama.

Maximum euclidean and cosine distance between "permutation" vectors? en Español

Maximum euclidean and cosine distance between "permutation" vectors?

If a, b, and c are real numbers, and a Maximum euclidean and cosine distance between "permutation" vectors? en Español

If a, b, and c are real numbers, and a Maximum euclidean and cosine distance between "permutation" vectors?

For over a year now, numerous permutation and combinations have been drawn and redrawn on the redefining 'below the poverty line' (BPL) population.

Even if the assassinations were not a case of mistaken identities, as has been reported, putting drones into the air is a permutation of a declaration of war.
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