adjective
Definition: Describing something that has only one part or element, or a system that allows communication in one direction only.
Example: The simplex communication system can only send messages in one direction at a time.
noun
Definition: A word that does not have any prefixes or suffixes, or a basic geometric shape with the least number of points needed to define it in a given space.
Example: In linguistics, a 'simplex' refers to a word like 'cat' that stands alone without any added parts.