noun

a decrease in loudness in a piece of music.

the sudden diminuendos are brilliantly effective

adverb

(especially as a direction) with a decrease in loudness.

the piece ends as it began, a poem of sorrow and regret that dissolves diminuendo

adjective

decreasing in loudness.

the diminuendo chorus before the final tumult

verb

decrease in loudness or intensity.

the singers left and the buzz diminuendoed