Crossword Genius

Mathematical exponent (9)

Ross

I believe the answer is:

logarithm

'mathematical exponent' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for logarithm that I've seen before include "It undoes power" , "Exponent" , "Aid to mathematical calculation" , "Power to which base number must be raised to obtain a given number" , "Mathematical aid simplifying multiplication and division - a girl moth (anag)" .)

I've seen this clue in The Times and The Sunday Times.
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