A person or thing that changes something. The new manager was a real changer, implementing several new policies that improved productivity.
A device or machine that changes the format or medium of something, such as a CD changer. He installed a CD changer in his car to enjoy a variety of music during long drives.
A piece of furniture or wall-mounted platform designed for changing a baby's diaper; a changing table. The public restroom was equipped with a changer so parents could tend to their infants conveniently.
A person whose business is to exchange one currency for another; a money changer. We found a street changer near the border who exchanged our dollars for pesos at a fair rate.