duplex

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Twofold; double.
• adjective Having two apartments, divisions, or floors.
• adjective Relating to or being a single assembly of machinery having two identical units that are capable of operating simultaneously or independently.
• adjective Electronics Of or relating to a communications mode, as in a telephone system, that provides simultaneous transmission and reception in both directions.
• noun A house divided into two living units or residences, usually having separate entrances.
• noun Something, such as an apartment, that is duplex.

from The Century Dictionary.

• In telegraphy, to arrange (a wire) so that two messages may be transmitted along it at the same time.
• To transmit telegraphic messages by the duplex system.
• Double; twofold.
• noun A doubling or duplicating.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb (Teleg.) To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.
• noun something which is duplex; -- used mostly in reference to a living unit, such as an apartment, in a building having two similar living units.
• noun (Biology, Genetics) a double-stranded region in a nucleic acid molecule. See deoxyribonucleic acid.
• adjective Double; twofold.
• adjective (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.
• adjective a peculiar kind of watch escapement, in which the scape-wheel has two sets of teeth. See Escapement.
• adjective one for turning off, screwing, and surfacing, by means of two cutting tools, on opposite sides of the piece operated upon.
• adjective a steam pump in which two steam cylinders are placed side by side, one operating the valves of the other.
• adjective (Eccl. Law) a complaint in the nature of an appeal from the ordinary to his immediate superior, as from a bishop to an archbishop.
• adjective a system of telegraphy for sending two messages over the same wire simultaneously.
• adjective one with a duplex escapement.
• adjective (Computers) 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).
• adjective (Computers) 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).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective double, made up of two parts
• adjective two direction (electronical signaling)
• noun house made up of two dwelling units
• noun philately a cancellation combining a numerical cancellation with a second mark showing time, date, and place of posting.
• noun juggling throwing motion where two balls are thrown with one hand at the same time.
• verb To make duplex.
• verb To make into a duplex.
• verb jugging To make a series of duplex throws.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a house with two units sharing a common wall
• verb change into a duplex
• adjective (used technically of a device or process) having two parts
• noun an apartment having rooms on two floors that are connected by a staircase
• adjective allowing communication in opposite directions simultaneously