Etymology
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pianissimo (adv.)

musical instruction, "with the minimum of force or loudness," 1724, from Italian pianissimo "very softly," superlative of piano, which is ultimately is from Latin planus "flat, smooth, even," later "soft" (from PIE root *pele- (2) "flat; to spread").

updated on May 30, 2020

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Definitions of pianissimo from WordNet
1
pianissimo (n.)
(music) low loudness;
Synonyms: piano
2
pianissimo (adv.)
a direction in music; to be played very softly;
Synonyms: very softly
3
pianissimo (adj.)
(chiefly a direction or description in music) very soft;
From wordnet.princeton.edu, not affiliated with etymonline.