accelerando

noun

1. A tempo mark directing that a passage is to be played at an increasing speed.
2. A passage having this mark.
3. (broadly)Accelerating or exponential advancement or development (of a thing).

   “The accelerando of the sciences and of technology, their mathematization have beggared both the reach and the veracity of natural language.”

adv

1. (not-comparable)With a gradual increase in speed.