Crossword Genius

Without a mathematical sign (5)

Ross

I believe the answer is:

minus

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This might be a double definition.

'without' is the first definition.
(minus means without)

'a mathematical sign' is the second definition.
'minus' can be an answer for 'sign' (minus sign is a kind of sign). I am not sure about the 'a mathematical' bit.

Can you help me to learn more?

(Other definitions for minus that I've seen before include "Negative sign - negative thing" , "deficiency" , "Less, without" , "Lacking; below zero" , "Lacking; negative" .)

I've seen this clue in The Mirror.
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