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Meaning of intergradation

in•ter•gra•da•tion

Pronunciation: (in"tur-grā-dā'shun), [key]
— n.
  1. the act or process of intergrading or the state of being intergraded.
  2. an evolutionary process by which different species of organisms tend to merge through a series of intermediate stages or grades.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.