Definition of axis noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈæksɪs//
    ; NAmE NAmE//ˈæksɪs//
    (pl. axes
    BrE BrE//ˈæksiːz//
    ; NAmE NAmE//ˈæksiːz//
    Mathematical terminology, The Earth and the atmosphere
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  1. 1an imaginary line through the centre of an object, around which the object turns Mars takes longer to revolve on its axis than the Earth. the earth’s axis of rotation See related entries: The Earth and the atmosphere
  2. 2(specialist) a fixed line against which the positions of points are measured, especially points on a graph the vertical/horizontal axis The real wage is measured along the horizontal axis and the quantity of labour is measured along the vertical axis. The main road is on a north-south axis. the speed is measured along the horizontal axis See related entries: Mathematical terminology
  3. 3(geometry) a line that divides a shape into two equal parts an axis of symmetry The axis of a circle is its diameter.
  4. 4[usually singular] (formal) an agreement or alliance between two or more countries the Franco-German axis
  5. Word Originlate Middle English: from Latin, ‘axle, pivot’.
See the Oxford Advanced American Dictionary entry: axis