Crossword Genius

Function or equation (9)

Ross

I believe the answer is:

quadratic

(Other definitions for quadratic that I've seen before include "Sort of equation in algebra" , "Mathematical expression containing a variable raised to the second power" , "Type of algebraic equation" , "(In maths) a type of equation" , "(In algebra) kind of equation - resembling a square" .)

I've seen this clue in The Guardian.
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