1. the line about which a rotating body, such as the earth, turns.
2. Mathematics.
• a central line that bisects a two-dimensional body or figure.
• a line about which a three-dimensional body or figure is symmetrical.
3. Anatomy.
• a central or principal structure, about which something turns or is arranged: the skeletal axis.
• the second cervical vertebra.
4. the longitudinal support on which organs or parts are arranged; the stem and root; the central line of any body.
5. any line used as a fixed reference in conjunction with one or more other references for determining the position of a point or of a series of points forming a curve or a surface.
6. crystallographic axis.
7. any one of three lines defining the attitude of an airplane, one being generally determined by the direction of forward motion and the other two at right angles to it and to each other.
8. an imaginary line, in a given formal structure, about which a form, area, or plane is organized.
9. an alliance of two or more nations to coordinate their foreign and military policies, and to draw in with them a group of dependent or supporting powers.
10. (in World War II) Germany, Italy, and Japan, often with Bulgaria, Hungary, and Romania.
11. a principal line of development, movement, direction, etc.

1. axis deer.

1. a real or imaginary line about which a body, such as an aircraft, can rotate or about which an object, form, composition, or geometrical construction is symmetrical
2. one of two or three reference lines used in coordinate geometry to locate a point in a plane or in space
3. the second cervical vertebra
4. the main central part of a plant, typically consisting of the stem and root, from which secondary branches and other parts develop
5. an alliance between a number of states to coordinate their foreign policy
6. the line of symmetry of an optical system, such as the line passing through the centre of a lens
7. an imaginary line along the crest of an anticline or the trough of a syncline
8. one of three lines passing through the centre of a crystal and used to characterize its symmetry

1. any of several S Asian deer of the genus Axis, esp A. axis. They typically have a reddish-brown white-spotted coat and slender antlers

• the alliance of Nazi Germany, Fascist Italy, and Japan, established in 1936 and lasting until their defeat in World War II
• (as modifier)

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• ROLL-OFF (noun) Definition, Meaning & Examples