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See more synonyms for simplex on Thesaurus.com
  1. simple; consisting of or characterized by a single element.
  2. pertaining to or noting a telecommunications system permitting communication in only one direction at a time.
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noun, plural sim·plex·es, sim·pli·ces [sim-pluh-sees] /ˈsɪm pləˌsis/.
  1. 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.
  2. an apartment having all the rooms on one floor.
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Origin of simplex

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for simplex

underlying, rudimentary, straightforward, elemental, fundamental, abecedarian, basal, basic, beginning, clear, easy, essential, facile, initial, introductory, original, plain, prefatory, preliminary, primary

Examples from the Web for simplex

Historical Examples of simplex

British Dictionary definitions for simplex


  1. permitting the transmission of signals in only one direction in a radio circuit, etcCompare duplex
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  1. linguistics a simple not a compound word
  2. 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
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Word Origin for simplex

C16: from Latin: simple, literally: one-fold, from sim- one + plex, from plicāre to fold; compare duplex
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for simplex


"characterized by a single part," 1590s, from Latin simplex "single, simple, plain, unmixed, uncompounded," literally "onefold," from PIE root *sem- "one, together" (cf. Latin semper "always," literally "once for all;" Sanskrit sam "together;" see same) + *plac- "-fold," from PIE *plek- "to plait" (see ply (v.1.)). The noun is attested from 1892, "simple uncompounded word."

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Online Etymology Dictionary, © 2010 Douglas Harper