Jurat

Black's Law Dictionary 5th Edition

The term "jurat" in Black's Law Dictionary refers to the clause written at the foot of an affidavit, stating when, where, and before whom the affidavit was sworn. It is a certification added to an affidavit that confirms the oath or affirmation was made before a competent officer. 

The word originates from the Latin "juratus," meaning "sworn," and is related to the word "jury". In historical contexts, "jurat" could also refer to a person under oath or an officer of the nature of an alderman in certain municipal corporations in England. Additionally, in old English law, "jurata" referred to a jury of twelve men sworn, particularly distinguished from the assisa.