Crossword Genius

Math ratio (4)

Ross

I believe the answer is:

'math ratio' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sine that I've seen before include "Mathematical function" , "Indefinitely, with no appointed date - . . . . die" , "Trigonometrical function" , "Latin tag for indefinitely - . . . . die" , "Trigonometric function" .)

I've seen this clue in the Penny Press.
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