The dispatching, for reception elsewhere, of a signal, message, or other form of information. 2. The propagation of a signal, message, or other form of information by any means, such as by telegraph, telephone, radio, television, or facsimile via any medium, such as wire, coaxial cable, microwave, optical fiber, or radio frequency. 3. In communications systems, a series of data units, such as blocks, messages, or frames. 4. The transfer of electrical power from one location to another via conductors.