Accelerando vs. Ritardando: What's the Difference?

Accelerando and Ritardando Definitions
Accelerando
Gradually accelerating or quickening in time. Used chiefly as a direction.
Ritardando
Gradually slowing in tempo; retarding. Used chiefly as a direction.
Accelerando
An accelerando passage or movement.
Ritardando
(music) Gradually decelerating the tempo of a piece of music, especially at the end of the piece.
Accelerando
(music) A tempo mark directing that a passage is to be played at an increasing speed.
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Ritardando
(music) Having a gradually decelerating tempo.
Accelerando
(music) A passage having this mark.
Ritardando
(music) An instance of gradually decelerating the tempo of a piece of music.
Accelerando
(by extension) Accelerating or exponential advancement or development (of a thing).
Ritardando
Retarding; - a direction for slower time; rallentado.
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Accelerando
(music) With a gradual increase in speed.
Ritardando
Gradually decreasing in tempo
Accelerando
Gradually accelerating the movement.
Accelerando
A gradually increasing tempo of music;
My ear will not accept such violent accelerandos
Accelerando
Gradually increasing in tempo
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Accelerando
With increasing speed;
Here you must play accelerando