axis

ax-is · noun

imported

Definitions

noun

  1. 1.

    An imaginary line about which a body rotates.

  2. 2.

    (Mathematics/Geometry) A fixed reference line for the measurement of coordinates.

  3. 3.

    (Anatomy) The second cervical vertebra, which allows rotation of the head.

  4. 4.

    (Politics/History) An alliance between countries or groups.

  5. 5.

    A central or principal structure or element around which others are organized.

Forms

plural: axes

Phrases & expressions

  • •
    axis of evil — A politically charged term for countries viewed as threats.
  • •
    axis of symmetry — A line dividing a shape into mirror images.
  • •
    on its axis — Rotating around a central line.

Related words

See also: axle, coordinate, pivot, rotate
Synonyms: centerline, pivot, spindle

Etymology

From Latin axis ("axle, pivot"), from Proto-Indo-European h₂eḱs- ("axis, axle"). Related to Greek axōn and Sanskrit ákṣa.