·noun Barter; exchange.
II. Permutation ·noun Any one of such possible arrangements.
III. Permutation ·noun The act of permuting; exchange of the thing for another; mutual transference; interchange.
IV. Permutation ·noun The arrangement of any determinate number of things, as units, objects, letters, ·etc., in all possible orders, one after the other;
— called also alternation. ·cf. Combination, ·noun, 4.