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ordinate vs. abscissa

[ awr-dn-it, -eyt ]
noun
  1. (in plane Cartesian coordinates) the y-coordinate of a point: its distance from the x-axis measured parallel to the y-axis.
[ ab-sis-uh ]
noun,
  1. (in plane Cartesian coordinates) the x-coordinate of a point: its distance from the y-axis measured parallel to the x-axis.

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