intergradational

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

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