coloration, especially of the skin.
Biology. coloration with or deposition of pigment.

1865–70; < Late Latin pigmentāt(us) painted, colored (see pigment, -ate1) + -ion

hyperpigmentation, noun
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World English Dictionary
pigmentation (ˌpɪɡmənˈteɪʃən)
1.  coloration in plants, animals, or man caused by the presence of pigments
2.  the deposition of pigment in animals, plants, or man

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pigmentation pig·men·ta·tion (pĭg'mən-tā'shən)

  1. Coloration of tissues by pigment.

  2. Deposition of pigment by cells.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The final picture shows pigmentation preserved in a fossil feather.
At any time the tree colors up pretty much all at once, and has clean, even
He explains that typically, melanistic birds will have white spots where
  melanin pigmentation has failed to color the feathers.
However, acid rain bled the trees of their pigmentation, turning them ashen
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