1. n. (musical instruments) A keyboard musical instrument, usually ranging over seven octaves, with white and black keys, played by pressing these keys, causing hammers to strike strings.
The piano in his house takes up a lot of space.
She has been taking lessons for many years and now plays piano very well.
He can play "Happy Birthday" on the piano.
Most of the works by Frédéric Chopin are for the piano.
2. adj. (music) Soft, quiet.
3. adj. In extended use; quiet, subdued.
4. adv. (music) Softly, as a musical direction (abbreviated to p. in sheet music).