■ noun each of several possible ways in which a set or number of things can be ordered or arranged.
↘ Mathematics the action of changing the arrangement of a set of items.
↘ Brit. a selection of a specified number of matches in a football pool.
Derivatives
~al adjective
Origin
ME (in the sense 'exchange, barter'): via OFr. from L. permutatio(n-) , from permutare (see permute ).