interchangeable
In`ter*change"a*ble, a. Etym: [Cf. OF. entrechangeable.] 1. Admitting of exchange or mutual substitution. "Interchangeable warrants." Bacon. 2. Following each other in alternate succession; as, the four interchangeable seasons. Holder. -- In`ter*change"a*ble*ness, n. -- In`ter*change"a*bly, adv.