intergradation

[in-ter-grey-dey-shuhn]
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:
1870–75; inter- + gradation

intergradational, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
intergrade
 
vb
1.  (intr) (esp of biological species, etc) to merge one into another
 
n
2.  an intermediate stage or form
 
intergra'dation
 
n
 
intergra'dational
 
adj
 
inter'gradient
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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