Crossword Genius

In mathematics, (of a number or quantity) not expressible as a ratio of two integers (10)

Ross

I believe the answer is:

irrational

(Other definitions for irrational that I've seen before include "not sensible" , "Kind of numbers" , "Illogical" , "nuts" , "Unreasonable" .)

I've seen this clue in The Independent.
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