Piano (noun)

1. A large musical instrument, typically with a keyboard, that is played by pressing keys to make hammers strike strings and produce sounds.
2. A musical instrument similar to a harpsichord but larger and louder and having a horizontal row of black and white keys.
3. A keyboard instrument having wire strings that sound when struck by felt-covered hammers operated from a keyboard.

Origin:

Mid 18th century: abbreviation of piano-forte, from italian piano "soft" + forte "loud", because the instrument can play both softly and loudly.

Examples:

1. He played the piano beautifully.
2. She took piano lessons as a child.
3. The piano was out of tune.
4. He composed music on the piano.
5. She played a piano piece in the recital.