1. Consisting of or marked by only one part or element. 2. Of or relating to a telecommunications system in which only one message can be sent in either direction at one time.
NOUN:
Inflected forms: pl. sim·plex·es or sim·pli·ces (-pl-sz) 1.Mathematics A Euclidean geometric spatial element having the minimum number of boundary points, such as a line segment in one-dimensional space, a triangle in two-dimensional space, or a tetrahedron in three-dimensional space. 2.Linguistics A word that has no affixes and is not part of a compound; a simple word.