Word:

Duplex

Du´plex
a.1.Double; twofold.
2.(Computers) organized so that data may be transmitted in two opposite directions over the same channel; - of communications channels, such as data transfer lines between computers.
Duplex escapement
a peculiar kind of watch escapement, in which the scape-wheel has two sets of teeth. See Escapement.
Duplex lathe
one for turning off, screwing, and surfacing, by means of two cutting tools, on opposite sides of the piece operated upon.
Duplex pumping engine
a steam pump in which two steam cylinders are placed side by side, one operating the valves of the other.
Duplex querela
(Eccl. Law) a complaint in the nature of an appeal from the ordinary to his immediate superior, as from a bishop to an archbishop.
Duplex telegraphy
a system of telegraphy for sending two messages over the same wire simultaneously.
- Mozley & W.
Duplex watch
one with a duplex escapement.
half duplex
a - (Computers) arranged so that the information may be transmitted in both directions, but only in one direction at a time; - of communications channels between computers; contrasted with full duplex(a).
b - arranged so that the information transmitted to the remote computer also appears on the local terminal; - of communications channels between computers; contrasted with full duplex(b).
full duplex
a - (Computers) arranged so that the information may be transmitted in both directions simultaneously; - of communications channels between computers; contrasted with half duplex(a).
b - arranged so that the information transmitted to the remote computer does not appear on the local terminal; - of communications channels between computers; contrasted with half duplex(b).
v. t.1.(Teleg.) To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.
n.1.something which is duplex; - used mostly in reference to a living unit, such as an apartment, in a building having two similar living units.
2.(Biology, Genetics) a double-stranded region in a nucleic acid molecule. See deoxyribonucleic acid.
Noun1.duplex - a house with two units sharing a common wall
2.duplex - an apartment having rooms on two floors that are connected by a staircase
Adj.1.duplex - (used technically of a device or process) having two parts; "a duplex transaction"
2.duplex - allowing communication in opposite directions simultaneously; "duplex system"; "duplex telephony"
(communications)duplex - Used to describe a communications channel that can carry signals in both directions, in contrast to a simplex channel which only ever carries a signal in one direction.

If signals can only flow in one direction at a time the communications is "half-duplex", like a single-lane road with traffic lights at each end. Walkie-talkies with a "press-to-talk" button provide half-duplex communications.

If signals can flow in both directions simultaneously the communications is "full-duplex", like a normal two-lane road. Telephones provide full-duplex communications.

The term "duplex" was first used in wireless, telegraph, and telephone communications. Nearly all communications circuits used by computers are two-way, so the term is seldom used.

http://www.cit.ac.nz/smac/dc100www/dc_014.htm.
Janus-like, ambidextrous, apartment house, bifacial, bifold, biform, bifurcated, bilateral, binary, binate, biparous, bipartisan, bipartite, bivalent, condominium, conduplicate, cooperative apartment house, dichotomous, disomatous, double, double-barreled, double-faced, duadic, dual, dualistic, duple, duplex house, duplicate, duplicated, dyadic, flats, geminate, geminated, high-rise apartment building, identical, matched, second, secondary, tenement, twain, twin, twinned, two, two-faced, two-level, two-ply, two-sided, two-story, twofold
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