RhymeZone: simplexes definitions

Definitions of simplex:

adjective: having only one part or element
Example: "A simplex word has no affixes and is not part of a compound--like `boy' compared with `boyish' or `house' compared with `houseboat'"
adjective: allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time
Example: "Simplex system"