Accelerando has 5 different meanings across 3 categories:
a gradually increasing tempo of music
"my ear will not accept such violent accelerandos"
A tempo mark directing that a passage is to be played at an increasing speed.
(music) gradually increasing in tempo
with a gradual increase in speed
This musical term comes from the Italian word accelerando, which is derived from the Latin verb accelero. In its original form, it meant to hasten or speed up.