What+is+permutation?

1. transformation: a change or transformation-§╦Θƒƒδ┘ 2. arrangement: an arrangement of items created by moving or reordering them-§╦Θƒƒδ┘ 3. rearranging: the reordering or rearranging of items in a group-§╦Θƒƒδ┘ 4. mathematics order of mathematical elements: an ordered arrangement of elements from a set-§╦Θƒƒδ┘

An arrangement or listing in which order is important.