Definition of rallentando in English:

rallentando

adjective & adverb

Music
  • (especially as a direction) with a gradual decrease of speed; ritardando.

noun

Music
  • A gradual decrease in speed; a ritardando.

    ‘the passage is marked by extravagant rallentandos’
    [mass noun] ‘the music moves on without rallentando or pause’

Origin

Italian, literally slowing down from the verb rallentare.

Pronunciation:

rallentando

/ˌralənˈtandō//ˌrälənˈtändō/