I. ri-ˌtär-ˈdän-(ˌ)dō, ˌrē- adverb or adjective
Etymology: Italian, from Latin retardandum, gerund of retardare to retard
Date: circa 1811
: with a gradual slackening in tempo — used as a direction in music
II. noun
( plural -dos )
Date: 1889
: a ritardando passage