Webster's English Dictionary

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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