x-axis

horizontal axis (Mathematics)

In mathematics, the Cartesian coordinate system (also called rectangular coordinate system) is used to determine each point uniquely in a plane through two numbers, usually called the x-coordinate and the y-coordinate of the point. To define the coordinates, two perpendicular directed lines (the x-axis or , and the y-axis or ), are specified, as well as the unit length, which is marked off on the two axes (see Figure 1). Cartesian coordinate systems are also used in space (where three coordinates are used) and in higher dimensions.
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Noun
1. the horizontal axis in a plane coordinate system
(hypernym) coordinate axis

x-axis /'eks'æksis/
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