simplex Meaning, Definition & Usage

1. adjective satellite 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. adjective satellite 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'

WordNet