From WordNet (r) 2.0 [wn]:
adjective
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'"
From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:
1. Used to describe a communications channel that can only ever carry a signal in one direction, like a one-way street. Television is an example of ({broadcast}) simplex communication. Opposite: {duplex}. 2. The {simplex method}. (2001-07-21)
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