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1. A series of lines, usually straight and parallel, superimposed on a chart or plotting sheet to serve as a directional reference for navigation. See graticule. </dd>
2. Two sets of mutually perpendicular lines dividing a map or chart into squares or rectangles to permit location of any point by a system of rectangular coordinates. See military grid, world geographic reference system. </dd>
3. An electrode with one or more openings to permit passage of electrons or ions. It usually consists of a wire mesh electrode placed between the anode and cathode of an electron tube to serve as a control of the current flowing between them. </dd>
4. Pertaining to or measured from a reference grid, as grid azimuth, grid latitude, grid meridian. </dd>


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use