Definitions
1.AdjectiveHaving four components.
2.AdjectiveOf or relating to a system in telegraphy by which four messages (two in each direction) can be sent on one wire simultaneously.
3.AdjectiveOf or relating to an early videotape format with four magnetic record/reproduce heads mounted on a headwheel spinning transversely across the tape.
4.NounA quadruplex system.
5.NounClipping of quadruplex videotape, an early type of videotape with four magnetic record/reproduce heads mounted on a headwheel spinning transversely across the tape.
6.VerbTo make quadruplex.