Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: permutacion, from Latin, from permutare 'to change completely'

permutation

 noun
     
per‧mu‧ta‧tion [countable]
one of the different ways in which a number of things can be arranged:
a sandwich shop that sells every possible permutation of meat and bread
Definition from the Longman Dictionary of Contemporary English
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