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Webster 1913 Edition

Noun.

The state or quality of being adherent; adherence.

[R.]

That which adheres.

[Obs.]

Dr. H. More.

Noun.

The same as adherence. In the sense of that which adhers, not legitimate.

adherency ‎(countable and uncountable, plural adherencies)

(obsolete) The state or quality of being adherent; adherence.
(obsolete) That which adheres.
(Can we find and add a quotation of Dr. H. More to this entry?)