1.
A ~ is a large musical instrument with a row of black and white keys. When you press these keys with your fingers, little hammers hit wire strings inside the ~ which vibrate to produce musical notes.
I taught myself how to play the ~...
He started ~ lessons at the age of 7.
...sonatas for cello and ~.
N-VAR: oft the N
see also grand ~ , upright ~
2.
A piece of music that is played ~ is played quietly. (TECHNICAL)
ADV: ADV after v