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x-axis

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  1. [coordinate systems] In a planar coordinate system, the horizontal line that runs right and left (east and west) of the origin (0,0). Numbers east of the origin are positive, and numbers west of it are negative. Media/x-axis.gif
  2. [coordinate systems] In a spherical coordinate system, a line in the equatorial plane that passes through 0 degrees longitude.
  3. [mathematics] On a chart, the horizontal axis.

See also