Crossword Genius

Probability expression (5)

Ross

I believe the answer is:

ratio

'probability expression' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ratio that I've seen before include "Eg, three to one" , "Comparative size" , "A trio (anag)" , "Proportion of one thing to another" , "9 to 5, say?" .)

I've seen this clue in the L.A. Times Daily, the LA Times and The Washington Post.
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