simple; consisting of or characterized by a single element.
pertaining to or noting a telecommunications system permitting communication in only one direction at a time.
noun, plural simplexes, simplices [sim-pluh-sees] .
Mathematics. a basic geometric element in a Euclidean space, being a line segment in one dimension, a triangle in two dimensions, a tetrahedron in three dimensions, and so on: used in topology and linear programming.
an apartment having all the rooms on one floor.

1585–95; < Latin: having a single layer, literally, one-fold, equivalent to sim-, base meaning “one” (akin to similis similar, Greek hén (neuter) one, homós same (see homo-), English same) + -plex -plex Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
simplex (ˈsɪmplɛks)
1.  Compare duplex permitting the transmission of signals in only one direction in a radio circuit, etc
2.  linguistics a simple not a compound word
3.  geometry the most elementary geometric figure in Euclidean space of a given dimension; a line segment in one-dimensional space or a triangle in two-dimensional space
[C16: from Latin: simple, literally: one-fold, from sim- one + plex, from plicāre to fold; compare duplex]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"characterized by a single part," 1594, from L. simplex "single, simple," from PIE base *sem- "one, together" (cf. L. semper "always," lit. "once for all;" Skt. sam "together;" see same) + *plac- "-fold." The noun is attested from 1892.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

simplex definition

1. Used to describe a communications channel that can only ever carry a signal in one direction, like a one-way street. Television is an example of (broadcast) simplex communication.
Opposite: duplex.
2. The simplex method.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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