Crossword Genius

0, for 180° (4)

Ross

I believe the answer is:

sine

(Other definitions for sine that I've seen before include "Indefinitely, with no appointed date - . . . . die" , "Trigonometrical function" , "Indispensable condition" , "Trig function" , "Opposite/hypoteneuse" .)

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