Open English Wordnet
Nouns
(n)piano, pianoforte, forte-pianoa keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds Adjectives
(a)piano, soft(used chiefly as a direction or description in music) soft; in a quiet, subdued tone“the piano passages in the composition” Adverbs
(r)piano, softlyused as a direction in music; to be played relatively softly