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2D

or 2-D

[too-dee]
adjective
  1. of, relating to, or representing something in two dimensions; two-dimensional: 2D computer graphics.
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noun
  1. a two-dimensional form or appearance: The theater is showing that film in 2D and in 3D.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018