| Noun | 1. | piano action - action consisting of a system of levers that move a felt hammer to strike the strings when a key is depressedaction mechanism, action - the operating part that transmits power to a mechanism; "the piano had a very stiff action" damper block, piano damper - damper consisting of a small felted block that drops onto a piano string to stop its vibration hammer - a striker that is covered in felt and that causes the piano strings to vibrate forte-piano, piano, pianoforte - a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds |