noun. A gradual change in a character or feature across the distributional range of a species or population, usually correlated with an environmental or geographic transition.

noun. A gradation in a character or phenotype within a species or other group.

noun. Any graduated continuum.

"Hate to muddy the waters, Jenny, but apparently it's not meaningful to give average weights because there is a "cline" in size from Spitzbergen, where the bears are smallest, to the Bering Strait where they are largest."

clinic  

clinal  

Aline  Combine  Dine  Heine  Jain  

clined  clines  clining