I. ˈsim-ˌpleks adjective
Etymology: Latin simplic-, simplex — more at simple
Date: 1594
1. : simple , single
2. : allowing telecommunication in only one direction at a time
simplex system
II. noun
( plural sim·plex·es )
Date: 1892
1. or plural sim·pli·ces -plə-ˌsēz or sim·pli·cia sim-ˈpli-sh(ē-)ə : a simple word
2. : a spatial configuration of n dimensions determined by n + 1 points in a space of dimension equal to or greater than n
a triangle together with its interior determined by its three vertices is a two-dimensional simplex in the plane or any space of higher dimension