Simplex

['sɪmpleks] or ['sɪmplɛks]

Definition

(adj.) allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time; 'simplex system' .

(adj.) 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'' .

Typed by Barnaby--From WordNet