definition of
piano

[1] #1 piano n. [pianoforte, forte-piano] a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds. wn

[2] #2 piano r. [softly] used as a direction in music; to be played relatively softly. wn

[3] #3 piano n. [pianissimo] (music) low loudness. wn