1. (n.) The act of exchanging one thing for another; rearrangement of items in a group\; mutual transference; interchange.

2. (n.) 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, n., 4.

3. (n.) Any one of such possible arrangements.

4. (n.) Barter; exchange.

alteration alternation avatar battledore and shuttlecock catabolism catalysis commutation consubstantiation cooperation counterchange cross fire displacement exchange give-and-take heterotopia innovation interchange intermutation interplay lex talionis measure for measure metabolism metagenesis metamorphism metamorphosis metastasis metathesis metempsychosis modification mutant mutated form mutation mutual admiration mutual support mutual transfer mutuality novelty quid pro quo reciprocality reciprocation reciprocity reincarnation retaliation something for something sport tit for tat transanimation transfiguration transfigurement transformation transformism translation translocation transmigration transmogrification transmutation transposal transposition transubstantiation vicissitude