1. Any electrically-operated piano (as opposed to a foot-pumped or hand-cranked piano). 2. Coin-operated piano, or coin piano. Term widely used by coin piano makers during the early 20th century. * Synonym: nickelodeon (modern usage; See nickelodeon). 3. A hand-played piano with electronic amplification of the tone-producing mechanism. Term used from the 1940s through the 1980s, when this type of electric piano was replaced by electronically-synthesized piano.