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Webster 1913 Edition

Noun.

[See

(Law)

One who acknowledged the right of the plaintiff or cognizee in a fine; the defendant.

Blackstone.

Noun.

One who acknowledges the right of the plaintiff or cognizee, in a fine; otherwise called the defendant or deforciant.

cognizor ‎(plural cognizors)

(law) One who acknowledged the right of the plaintiff or cognizee in a fine; the defendant.
(Can we find and add a quotation of Blackstone to this entry?)