Synonyms of the word 
DIMINUENDO → DECREASING - DECRESCENDO - SOFTNESS
diminuendo
- n. (music) A dynamic mark directing that a passage is to be played gradually more softly.
- n. (music) A passage having this mark.
- adv. (music) played in this style.
- adj. (music) describing a passage having this mark.
decreasing
- v. present participle of decrease.
decrescendo
- n. (music) An instruction to play gradually more softly.
- v. (music) To gradually become quieter.
- adj. becoming quieter gradually.
softness
- n. The quality of being soft.
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