permutation

ot noun

1. One of the ways something exists, or the ways a set of objects can be ordered. Which permutation for completing our agenda items makes the most sense?
2. A one-to-one mapping from a finite set to itself. This permutation takes each element to the one following it, with the last mapped back to the first.
3. An ordering of a finite set of distinct elements. There are six permutations of three elements, e.g. {abc, acb, bac, bca, cab, cba}.
4. A transformation of a set's prime form, by applying one or more of certain operations, specifically, transposition, inversion, and retrograde.