in·ter·gra·da·tion

[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

in·ter·gra·da·tion·al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To intergradation
Collins
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Intergradation is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
Example sentences
There is a broad zone of intergradation between them.
Most other populations represent some intergradation with the western
  subspecies.
These isolated refugia result in multiple zones of secondary intergradation.
Geographic patterns of intergradation between the subspecies have not been
  defined.
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