The load connected to a transmission line, circuit, or device. Note: For a uniform transmission line, if the termination impedance is equal to the characteristic impedance of the line, wave reflections from the end of the line will be avoided. 2. In hollow metallic waveguides, the point at which energy propagating in the waveguide continues in a nonwaveguide propagation mode into a load. 3. An impedance, often resistive, that is connected to a transmission line or piece of equipment as a dummy load, for test purposes.