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[in-ter-grey-dey-shuh n] /ˌɪn tər greɪˈdeɪ ʃən/
the act or process of intergrading or the state of being intergraded.
an evolutionary process by which different species of organisms tend to merge through a series of intermediate stages or grades.
Origin of intergradation
1870-75; inter- + gradation
Related forms
intergradational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for intergradation
  • Most other populations represent some intergradation with the western subspecies.
  • intergradation in the fruit character makes it difficult to discern clear distributional boundaries.
  • Geographic patterns of intergradation between the subspecies have not been defined.
  • There is a broad zone of intergradation between them.
  • And, there is no evidence of intergradation with respect to eye patch size and shape among these forms to suggest interbreeding.
  • These isolated refugia result in multiple zones of secondary intergradation.

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