Definition of piano noun from the Oxford Advanced American Dictionary

  

piano

 noun
noun
NAmE//piˈænoʊ//
 
(pl. pianos)(old-fashioned, formal pianoforte
NAmE//piˌænəˈfɔrteɪ//
 
, NAmE//piˈænəˌfɔrt//
 
)
 
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  a large musical instrument played by pressing the black and white keys on the keyboard. The sound is produced by small hammers hitting the metal strings inside the piano to play the piano playing jazz on the piano piano music a piano teacher/lesson Ravel's piano concerto in G a sonata for violin and piano Alison Evans provided piano accompaniment. see also grand piano, upright piano
See the Oxford Advanced Learner's Dictionary entry: piano