Definitions

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

  • adj. Having or appearing to have only one color.
  • adj. Of or composed of radiation of only one wavelength: monochromatic light.
  • adj. Done in monochrome: monochromatic prints and paintings.
  • adj. Of or exhibiting monochromatism.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having only one color, represented by differing hues and tints. For example shades in a black and white television.
  • adj. Perceptive of only one color; unable to distinguish colors; total color blindness.
  • adj. Plain, dull, lifeless.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Consisting of one color, or presenting rays of light of one color only.

from The Century Dictionary and Cyclopedia

  • Consisting of light of one wave-length, and in that sense of one color only, as the light produced by a Bunsen flame in which sodium is being volatilized.
  • In psychology, pertaining to or characterized by monochromasy: as, monochromatic vision.
  • Having an affinity for only one dye at a time, in contradistinction to polychromatic.
  • n. Same as monochromate, 2.

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

  • adj. (of light or other electromagnetic radiation) having only one wavelength
  • adj. having or appearing to have only one color
  • adj. of or relating to monochromatism

Etymologies

From mono- +‎ chromatic, mono- from Ancient Greek μόνος (monos, "alone, only, sole, single"), chromatic from Ancient Greek χρῶμα (khroma, "color"). (Wiktionary)

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