Gradate vs Cline - What's the difference?

As a verb gradate

is to change imperceptibly from one gradation of tone etc. to another.

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

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(gradat)

To change imperceptibly from one gradation of tone etc. to another

To arrange in order of grades

(chemistry) To bring to a certain strength or grade of concentration.

to gradate a saline solution

(en noun)

(biology) A gradation in a character or phenotype within a species or other group.

Any graduated continuum.

* 2005 , Ronnie Cann, Ruth Kempson and Lutz Marten, The Dynamics of Language, an Introduction , p. 412

This account effectively reconstructs the well-known grammaticalisation cline from anaphora to agreement, …

* clinal