simplex

adjectives

allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time
"simplex system"
simplex
is similar to
operating or moving or allowing movement in one direction only
"a unidirectional flow"; "a unidirectional antenna"; "a unidirectional approach to a problem"
unidirectional
domain category
(often plural) systems used in transmitting messages over a distance electronically
telecom, telecommunication
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
is similar to
having few parts; not complex or complicated or involved
"a simple problem"; "simple mechanisms"; "a simple design"; "a simple substance"
simple