from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Consisting of or marked by only one part or element.
  • adj. Of or relating to a telecommunications system in which only one message can be sent in either direction at one time.
  • n. Mathematics A Euclidean geometric spatial element having the minimum number of boundary points, such as a line segment in one-dimensional space, a triangle in two-dimensional space, or a tetrahedron in three-dimensional space.
  • n. Linguistics A word that has no affixes and is not part of a compound; a simple word.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Single, simple; not complex.
  • adj. unidirectional
  • n. An analogue in any dimension of the triangle or tetrahedron: the convex hull of n+1 points in n-dimensional space.
  • n. A simple word, one without affixes.

from The Century Dictionary and Cyclopedia

  • Simple; single: applied to telegraphy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. having only one part or element
  • adj. allowing communication in only one direction at a time, or in telegraphy allowing only one message over a line at a time


Latin, simple; see sem-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin (Wiktionary)



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