"piano" in the noun sense

1. piano, pianoforte, forte-piano

a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds

2. piano, pianissimo

music) low loudness

"piano" in the adjective sense

1. piano, soft

used chiefly as a direction or description in music) soft in a quiet, subdued tone

"the piano passages in the composition"

"piano" in the adverb sense

1. piano, softly

used as a direction in music to be played relatively softly

Source: WordNet® (An amazing lexical database of English)

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