x, y and z, in math (4)
I believe the answer is:
axes
'x y and z in math' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for axes that I've seen before include "Chopping tools" , "Chops" , "X, Y scales on graph" , "Main graph lines" , "lines at fourteen's [RIGHT ANGLES]" .)