What is Affeer?

Legal Definition
To assess, llquldate, appraise, fix in amount. To affeer an amercement. To establish the amount which one amerced in a court-leet should pay. To affeer an account. To confirm it on oath in the exchequer. Cowell; Blount; Spelman.
-- Black's Law Dictionary
Legal Definition
To appraise; to assess.
-- Ballentine's Law Dictionary