Crossword Genius

Increase of speed (12)

Ross

I believe the answer is:

acceleration

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">increase of speed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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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