Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun algebraic geometry The direction aligned with the xaxis of a
coordinate system .
Etymologies
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Examples

Similarly, observer O sees an airplane moving at velocity in the xdirection, in the ydirection, and in the zdirection.

Neither photon 1 nor photon 2 is in a definite polarization state when the pair is in the state  Ï, but their potentialities (in the terminology of Heisenberg 1958) are correlated: if by measurement or some other process the potentiality of photon 1 to be polarized along the xdirection or along the ydirection is actualized, then the same will be true of photon 2, and conversely.
Bell's Theorem Shimony, Abner 2009

Thus, if a quantum mechanical system (say, an electron) is described by a superposition of two given states, say, spin in xdirection equal +1/2 and spin in xdirection equal

The point of contact of the wheel r or any point of the carriage C will therefore always move in a direction making an angle [phi] with the axis of x, whilst it moves in the xdirection through the same distance as the point B on the ycurve  that is to say, it will trace out the integral curve required, and so will any point rigidly connected with the carriage C.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

This means that the bird was moving at a constant velocity in the xdirection.
Wired Top Stories Rhett Allain 2010

To determine the x  and ycomponent of the force notice that o ne charge exerts a force in the xdirection only, one charge exerts a force in the ydirection only, and one charge exerts a force that needs to be broken down into x and y components.

(B) Fluorescence intensity is represented as a carpet with the line in the xdirection and the time in the ydirection.
PLoS ONE Alerts: New Articles Francesco Cardarelli et al. 2010

The movement is shown by a vector: movement in the xdirection movement in the ydirection

Tethered Mass and Spring is a free program that shows a mass constrained to move in the xdirection by a horizontal rod and connected to a spring of natural length L = 10.

I Want panel 1 to take 1/10 of space in xdirection, panel 2 8/10 and panel 3 1/10 to.
DaniWeb IT Discussion Community SasseMan 2010
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