Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The horizontal axis of a two-dimensional Cartesian coordinate system.
  • n. One of three axes in a three-dimensional Cartesian coordinate system.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The axis on a graph that is usually drawn left to right and usually shows the range of values of an independent variable.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the horizontal axis in a plane coordinate system

Etymologies

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