simplex
1. [ adjective ] (telecommunication) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time
Examples:

"simplex system"

Related terms: telecommunication unidirectional
2. [ adjective ] having only one part or element
Examples:

"a simplex word has no affixes and is not part of a compound--like `boy' compared with `boyish' or `house' compared with `houseboat'"

Related terms: simple simple
Similar spelling:   simple
  Simpler
  simple_eye
  simpleton
  simply
  simpleness
  simplify
  Semple
  sample