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simplex (adj.)

"characterized by a single part," 1590s, from Latin simplex "single, simple, plain, unmixed, uncompounded," literally "onefold," from PIE compound of root *sem- (1) "one; as one, together with" + *plac- "-fold," from PIE root *plek- "to plait." The noun is attested from 1892, "simple uncompounded word."

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Definitions of simplex from WordNet

simplex (adj.)
allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time;
simplex system
simplex (adj.)
having only one part or element;
a simplex word has no affixes and is not part of a compound--like `boy' compared with `boyish' or `house' compared with `houseboat'
From wordnet.princeton.edu