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intergradation

[in-ter-grey-dey-shuh n]
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noun
  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.

Origin of intergradation

First recorded in 1870–75; inter- + gradation
Related formsin·ter·gra·da·tion·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for intergradation

Historical Examples

  • The specimen shows evidence of intergradation with excubitorides.

    Birds from Coahuila, Mexico

    Emil K. Urban

  • No evidence of intergradation with any other race was noted.

  • Intergradation is noted also in animals from Schreiber, Ontario.

  • The intergradation between cicognanii and richardsonii is gradual.

    American Weasels

    E. Raymond Hall

  • Intergradation with invicta is shown by specimens from southwestern Montana.

    American Weasels

    E. Raymond Hall