diminuendo /dɪˌmɪnjuːˈɛndəʊ/noun 3adjective 1adverb 1forms 3 noun3 •A passage having this mark •(figurative) The gradual dying away of something.Harlow gazed, like Henry, out the wide corner window, enjoying the diminuendos of the light. — 1998 •A dynamic mark directing that a passage is to be played gradually more softly adjective1 •describing a passage having this mark adverb1 •played in this style formsdiminuendos · more diminuendo · most diminuendo