piano (n.)

"percussion musical instrument in which tones are produced by blows of hammers upon stretched strings, the hammers being operated from a keyboard," 1803, from French piano (18c.), Italian piano, shortened forms of pianoforte (q.v.).

Essentially, the pianoforte is a large dulcimer with a keyboard ; but historically it replaced the clavichord and harpsichord, which were keyboard-instruments more akin to the harp than to the dulcimer. [Century Dictionary]

Piano wire "kind of strong steel wire used for strings of pianos," is attested from 1831. Piano-case "wooden box enclosing the mechanism of a piano" is by 1844.

piano (adv.)

musical instruction, "softly, with little force or loudness," 1680s, from Italian piano, which is ultimately is from Latin planus "flat, smooth, even," later "soft" (from PIE root *pele- (2) "flat; to spread").

updated on June 08, 2020

Definitions of piano from WordNet
piano (n.)
a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds;
Synonyms: pianoforte / forte-piano
piano (n.)
(music) low loudness;
Synonyms: pianissimo
piano (adv.)
used as a direction in music; to be played relatively softly;
Synonyms: softly
piano (adj.)
(used chiefly as a direction or description in music) soft; in a quiet, subdued tone;
the piano passages in the composition
Synonyms: soft
Etymologies are not definitions. From, not affiliated with etymonline.