simplex

Adjective
  1. Allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time (synset 300236114)
    "simplex system"
  2. Having only one part or element (synset 302182827)
    "a simplex word has no affixes and is not part of a compound--like `boy' compared with `boyish' or `house' compared with `houseboat'"

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