Bridging loss: At a given frequency, the loss that results when an impedance is connected across a transmission line.

Note: Bridging loss is expressed as the ratio, in dB, of the signal power delivered, prior to bridging, to a given point in a system downstream from the bridging point, to the signal power delivered to the given point after bridging.

Source: from Federal Standard 1037C and from MIL-STD-188