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Adjective: simplex  sim-pleks
  1. Allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time
    "simplex system"
     
  2. 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'"

See also: simple, unidirectional

Encyclopedia: Simplex