| axis | | |
| n. (cognition) | 1. axis | a straight line through a body or figure that satisfies certain conditions. |
| ~ coordinate axis | one of the fixed reference lines of a coordinate system. |
| ~ major axis | the longest axis of an ellipse or ellipsoid; passes through the two foci. |
| ~ semimajor axis | one-half the major axis of an ellipse; the distance from the center of an ellipse to one end. |
| ~ minor axis | the shorter or shortest axis of an ellipse or ellipsoid. |
| ~ semiminor axis | one-half the minor axis of an ellipse. |
| ~ principal axis, optic axis | a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted.; "in a normal eye the optic axis is the direction in which objects are seen most distinctly" |
| ~ optic axis | in a doubly refracting crystal, the line in the direction of which no double refraction occurs.; "a crystal may have either one or two optic axes" |
| ~ line | a spatial location defined by a real or imaginary unidimensional extent. |
| n. (plant) | 2. axis | the main stem or central part about which plant organs or plant parts such as branches are arranged. |
| ~ stele | the usually cylindrical central vascular portion of the axis of a vascular plant. |
| ~ rachis | axis of a compound leaf or compound inflorescence. |
| ~ stalk, stem | a slender or elongated structure that supports a plant or fungus or a plant part or plant organ. |
| ~ spadix | the fleshy axis of a spike often surrounded by a spathe. |
| n. (group) | 3. axis | in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations.; "the Axis opposed the Allies in World War II" |
| ~ alignment, alinement, coalition, alliance | an organization of people (or countries) involved in a pact or treaty. |
| n. (group) | 4. axis, bloc | a group of countries in special alliance. |
| ~ alignment, alinement, coalition, alliance | an organization of people (or countries) involved in a pact or treaty. |
| ~ scheduled territories, sterling area, sterling bloc | the group of countries whose currencies are tied to the British pound sterling. |
| n. (body) | 5. axis, axis vertebra | the 2nd cervical vertebra; serves as a pivot for turning the head. |
| ~ cervical vertebra, neck bone | one of 7 vertebrae in the human spine located in the neck region. |
| ~ odontoid process | a toothlike process at the back of 2nd vertebra of the neck. |
| n. (artifact) | 6. axis, axis of rotation | the center around which something rotates. |
| ~ mechanism | device consisting of a piece of machinery; has moving parts that perform some function. |
| ~ pivot, pin | axis consisting of a short shaft that supports something that turns. |
| ~ rotor head, rotor shaft | the axis around which the major rotor of a helicopter turns. |
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