simplex
1. sim.plex \'sim-.pleks\ aj [L simplic-, simplex - more at SIMPLE] 1:
SIMPLE, SINGLE 2: allowing telecommunication in only one direction at a
time {~ s ystem}
2. simplex \-pl*-.se-z\ \sim-'plish-(e--)*\ n or sim.plex.es; or
sim.pli.ces; or sim.pli.cia pl pl 1: a simple word 2: a spatial
configuration determined by a number of points one more than t he number of
dimensions of the space
Webster's English Dictionary