/sim"pleks/ , adj., n. pl. simplexes, simplices /-pleuh sees'/ .
1. simple; consisting of or characterized by a single element.
2. pertaining to or noting a telecommunications system permitting communication in only one direction at a time.
3. Math. a basic geometric element in a Euclidean space, being a line segment in one dimension, a triangle in two dimensions, a tetrahedron in three dimensions, and so on: used in topology and linear programming.
4. an apartment having all the rooms on one floor.
[ 1585-95; sim-, base meaning "one" (akin to similis SIMILAR, Gk hén (neut.) one, homós same (see HOMO-), E SAME) + -plex -PLEX ]