Crossword Genius

Pi is one, for the circumference of a circle to its diameter (5)

Ross

I believe the answer is:

ratio

(Other definitions for ratio that I've seen before include "Proportion, relationship" , "Proportional relationship" , "Mathematical relation of one thing to another" , "Proportion, relation" , "Relation between two things, numbers say" .)

I've seen this clue in The New York Times.
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