Conductive coupling

Conductive coupling: Energy transfer achieved by means of physical contact, i.e., coupling other than inductive or capacitive coupling.

Note 1: Conductive coupling may be achieved by wire, resistor, or common terminal, such as a binding post or metallic bonding.

Note 2: Conductive coupling passes the full spectrum of frequencies, including dc. Synonym direct coupling.

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