"permutation" in the noun sense
1. substitution, permutation, transposition, replacement, switch
an event in which one thing is substituted for another
"the replacement of lost blood by a transfusion of donor blood"
2. permutation
the act of changing the arrangement of a given number of elements
3. permutation
complete change in character or condition
"the permutations...taking place in the physical world"- Henry Miller
4. permutation
act of changing the lineal order of objects in a group
Source: WordNet® (An amazing lexical database of English)
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