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Definition of axis : 1. 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.
2. A straight line, real or imaginary, passing through a body, on which it revolves, or may be supposed to revolve; a line passing through a body or system around which the parts are symmetrically arranged.
3. Also used of the body only of the vertebra, which is prolonged anteriorly within the foramen of the first vertebra or atlas, so as to form the odontoid process or peg which serves as a pivot for the atlas and head to turn upon.
4. One of several imaginary lines, assumed in describing the position of the planes by which a crystal is bounded.
5. The primary or secondary central line of any design.
6. The second vertebra of the neck, or vertebra dentata.
7. The spotted deer ( Cervus axis or maculata) of India, where it is called hog deer and parrah ( Moorish name).
8. The stem; the central part, or longitudinal support, on which organs or parts are arranged; the central line of any body.

Synonyms:

nerve center, combination, omphalos, chart, axis of rotation, central, curvature, diameter, confederation, base, crater, design, curve, bloc, chord, alliance, entente, federation, navel, ally, bilateral, accord, diagram, coalition, arc, ground zero, accession, diagonal, locus, union, axis vertebra, inclined plane, convention, seat, mecca, block graph, cynosure, the Geneva Convention, horizontal, coordinate, league, capital, corona, cross section, block, outline, sunspot, bell curve, combine, focus, magnitude, line, nexus, bar graph, eye

halfway point, average, hub, middle, medium, mediocrity, core, median, midpoint, center, bisection, heart, nub, half-and-half, nucleus, marrow, midst, pivot, epicenter, half, kernel, mean

line of revolution, pole, arbor, support, line of symmetry, dividing line, axle, stem, line of rotation, spindle

Usage examples:

• The vertical or principal axis is often much longer or shorter in this group, but the other two are always equal and lie in the horizontal plane, at right angles to each other, and at right angles to the vertical axis. - "The Chemistry, Properties and Tests of Precious Stones", John Mastin.
• Religion, he asserted in the fervid manner characteristic of him, was in these times the axis around which turned the inner life of the world and every individual. - "The Complete Historical Romances of Georg Ebers", Georg Ebers.
• " About," said Gud-" but as I left that world, I took hold of its axis and gave it another shake." - "The Book of Gud", Dan Spain Harold Hersey.