definition of
permutation

[1] #1 permutation n. [substitution, transposition, replacement, switch] an event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood". wn

[2] #2 permutation n. the act of changing the arrangement of a given number of elements. wn

[3] #3 permutation n. complete change in character or condition; "the permutations...taking place in the physical world"- Henry Miller. wn

[4] #4 permutation n. act of changing the lineal order of objects in a group. wn