Crossword Genius

Increase of speed (12)

Ross

I believe the answer is:

acceleration

'increase of speed' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for acceleration that I've seen before include "The increasing of speed" , "Speeding up" , "Rate of increase of speed" , "Speeding-up" .)

I've seen this clue in the Sydney Morning Herald.
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