simplex
adj.adj. having only one part or being very simple. In computing, it describes a system where data moves in only one direction at a time.
adj. consisting of a single part or element; in computing, referring to a communication system where data flows in only one direction at a time.
The simplex mode is used for basic radio communication.
In a simplex communication system, only one device can transmit data at a time, unlike a duplex system.
The simplex algorithm is a method for solving linear programming problems by moving from one vertex of the feasible region to another in search of an optimal solution.
The adjective is a learned borrowing from Latin simplex (“plain, simple; single”). The first part, sim-, comes from Proto-Indo-European sem-, sm̥- (“one; together”). The second part, -plex, may be from *pleḱ- (“to weave”). The noun is derived from the adjective. The plural forms simplices and simplicia are learned borrowings from Latin simplicēs (masculine or feminine) and simplicia (neuter), respectively plural forms of simplex. Noun noun sense 1 (“generalization of a triangle or tetrahedron to an arbitrary dimension”) was apparently coined by the Dutch mathematician Pieter Hendrik Schoute (1846–1913) as a short version of Simplicissimum in Mehrdimensionale Geometrie (in German, 1902). (In his pioneering works on algebraic topology, the French mathematician Henri Poincaré (1854–1912) had previously introduced the concept, but not the actual term simplex.)