As adverbs the difference between accelerando and ritardando
is that accelerando is (music) with a gradual increase in speed while ritardando is (music) gradually decelerating the tempo of a piece of music, especially at the end of the piece. Lol im in band i play Tuba and piano lol.
Well, accelerando is basically music with a increase of speed and ritardando is music decelerating the tempo of a piece of music, like at the end of a piece.