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Definition of permutation noun from the Oxford Advanced American Dictionary

 

permutation

 noun
noun
NAmE//ˌpərmyʊˈteɪʃn//
 
[usually plural]
 
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any of the different ways in which a set of things can be ordered The possible permutations of x, y, and z are xyz, xzy, yxz, yzx, zxy, and zyx.
See the Oxford Advanced Learner's Dictionary entry: permutation