Meaning of AXIS in English
( n. )
A straight line with respect to which the different parts of a magnitude are symmetrically arranged; as, the axis of a cylinder, i. e., the axis of a cone, that is, the straight line joining the vertex and the center of the base; the axis of a circle, any straight line passing through the center.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012