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  1. Dictionary
    Ax·is
    /ˈaksəs/

    noun

    • 1. an imaginary line about which a body rotates: "the Earth revolves on its axis once every 24 hours" Similar center lineverticalhorizontal
    • 2. a fixed reference line for the measurement of coordinates: "the variable that is thought of as a cause is placed on the horizontal axis, and the variable that is thought of as an effect on the vertical axis"