Easting n. : The distance measured toward the east between two meridians drawn through the extremities of a course; distance of departure eastward made by a vessel.

Example:
How do i convert longitude and latitude to Easting and Northing?

Taxonomy
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Defination from the web:
Easting refers to the eastward-measured distance (or the x-coordinate), while northing refers to the northward-measured distance (or the y-coordinate) ... be found using easting/northing (or x,y) pairs. As a convention, the pair is typically represented easting first, northing second. ...