simplex

Adj.	1.	simplex - 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.	simplex - 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'"

SIMPLEX. Simple or single; as, charta simplex, is a deed-poll, of single deed. Jacob's L. Dict. h.t.

1.	(communications)	simplex - 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.	(algorithm)	simplex - The simplex method.

simple