quadruple

adj 1: having four units or components; "quadruple rhythm has four

beats per measure" [syn: {quadruplicate}, {fourfold}]

2: four times as great or many; "a fourfold increase in the

dosage" [syn: {fourfold}]

n : a quantity that is four times as great as another

v : increase fourfold; "His stock earning quadrupled"

quadruplex

A kind of telegraphy system developed by

Thomas A. Edison in the 1870s combining {diplex} and {duplex}

communications to support simultaneous transmission of two

messages in each direction.

(2000-04-02)