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two-dimensional

[too-di-men-shuh-nl, -dahy-]
adjective
  1. having the dimensions of height and width only: a two-dimensional surface.
  2. (of a work of art) having its elements organized in terms of a flat surface, especially emphasizing the vertical and horizontal character of the picture plane: the two-dimensional structure of a painting.
  3. (in a literary work) shallow, unconvincing, or superficial in execution: a novel having two-dimensional characters.
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Origin of two-dimensional

First recorded in 1895–1900
Related formstwo-di·men·sion·al·i·ty, nountwo-di·men·sion·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for two-dimensional

two-dimensional

adjective
  1. of, having, or relating to two dimensions, usually describable in terms of length and breadth or length and height
  2. lying on a plane; having an area but not enclosing any volume
  3. lacking in depth, as characters in a literary work
  4. (of painting or drawing) lacking the characteristics of form or depth
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Derived Formstwo-dimensionality, nountwo-dimensionally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012