Meaning of PERMUTATION in English

PERMUTATION

/ ˌpɜːmjuˈteɪʃn; NAmE ˌpɜːrm-/ noun

[ usually pl. ] 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.

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WORD ORIGIN

late Middle English (in the sense exchange, barter ): via Old French from Latin permutatio(n-) , from the verb permutare change completely, from per- through, completely + mutare to change.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.