[sim.plex] adj [L simplic-, simplex--more at simple] (1594) 1: simple, single
2: allowing telecommunication in only one direction at a time "~ system"
[2]simplex n, pl sim.plex.es (1892) 1 or pl sim.pli.ces or sim.pli.cia : 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 ~ in the plane or any space of higher dimension"