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The Collaborative International Dictionary
Cognizor

Cognizor \Cog`ni*zor\, n. [See Cognizance.] (Law) One who acknowledged the right of the plaintiff or cognizee in a fine; the defendant.
--Blackstone.

Wiktionary
cognizor

n. (context legal English) One who acknowledged the right of the plaintiff or cognizee in a fine; the defendant.