[1] : WordNet (r) 2.0

simplex
     adj 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'"

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

simplex
     
        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
     
     
see also:
broadcast duplex simplex method 

[3] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

simplex. simple or single; as, charta simplex, is a deed-poll, of single 
deed. jacob's l. dict. h.t. 

Simplex >> S Words
Simplex, definition of term: Simplex
simplex_pag1.html

Herpes Simplex >> H Words
Herpes Simplex, definition of term: Herpes Simplex
herpes+simplex_pag1.html