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A Line with respect to which a curve or figure is drawn, measured, rotated, etc. The term is also used to refer to a Line Segment through a Range (Woods 1961).
See also Abscissa, Ordinate, x-Axis, y-Axis, z-Axis
References
Woods, F. S. Higher Geometry: An Introduction to Advanced Methods in Analytic Geometry. New York: Dover, p. 8, 1961.