coordinate axis
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Noun 1. coordinate axis - one of the fixed reference lines of a coordinate system
coordinate system, frame of reference, reference frame, reference system - a system that uses coordinates to establish position
axis - a straight line through a body or figure that satisfies certain conditions
x-axis - the horizontal axis in a plane coordinate system
y-axis - the vertical axis in a plane coordinate system
z-axis - the third axis in a 3-dimensional coordinate system
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