n. One who changes or alters the form of anything.n. One who deals in or changes money.n. One apt to change; an inconstant person.n. an electronic device which changes one replaceable medium for another, such as a record changer, which can store several records and move each one automatically to the playing table; or a CD changer, whch can store multiple compact disks and move each one to the reading slot, in a sequence determined by the user.