Crossword Genius

A mathematical process (8)

Ross

I think it could be either:

addition

division

'a mathematical process' is the definition.
(addition is a kind of mathematical process)

This is the entire clue.

(Other definitions for addition that I've seen before include "Calculation of the sum of numbers" , "Arithmetic calculation" , "Annexe" , "Mathematical process" , "One of the four basic planks of arithmetic" .)

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