Crossword Genius

x or y, in math class

Ross

I believe the answer is:

axis

(Other definitions for axis that I've seen before include "Line from N. to S. Pole" , "all revolves around this" , "On which a body spins" , "(Rotational?) alliance of powers" , "Imaginary line through the centre of an object on which it spins" .)

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