radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge (noun.phenomenon)
a slight depression in the smoothness of a surface(noun.shape)
an alternative to the regular channels of communication that is used when agreements must be made secretly (especially in diplomacy or government) (noun.communication)
line that is the commercial organization responsible for operating a system of transportation for trains that pull passengers or freight (noun.artifact)
(mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a more..(mathematics) the shortest line between two points on a mathematically defined surface (as a straight line on a plane or an arc of a great circle on a sphere)(noun.shape)
either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration (noun.artifact)
a line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction (noun.location)
a generic name for digital lines that are provided by telephone companies to their local subscribers and that carry data at high speeds (noun.artifact)
a drawing created by superimposing a semitransparent sheet of paper on the original image and copying on it the lines of the original image (noun.artifact)