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simplex
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As an adjective, simplex means single, simple. As a noun, it means an analogue in a space of arbitrary dimensionality of the triangle or tetrahedron.
Meanings of simplex
6 meaningsadjective
Single, simple; not complex.
telecommunicationsUnidirectional.
Allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time
“simplex system”
Having only one part or element
“a simplex word has no affixes and is not part of a compound — like ‘boy’ compared with ‘boyish’ or ‘house’ compared with ‘houseboat’”
noun
geometryalgebraic topologyAn analogue in a space of arbitrary dimensionality of the triangle or tetrahedron; the convex hull of n+1 linearly independent points in n-dimensional space; in other words, the triangle, tetrahedron etc., generalized to an arbitrary number of dimensions.
linguisticsA monomorphemic word, one without affixes.
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).