jurat
A sworn statement concerning where, when, and before whom an oath has been made.
The affidavit's jurat reads "Sworn this __ day of ________, 20__, before me" and is followed by the notary's signature. Looks like she forgot to fill it in.
A sworn person — A medieval informant: a man sworn to provide information about crimes committed in his neighborhood.
historical, obsolete
A sworn person — A juror.
obsolete
A sworn person — A councilman or alderman of the Cinque Ports.
obsolete
Where it comes from
From Medieval Latin iūrātus (“sworn [man]”) or iūrātum (“[that which is] sworn”), from Latin iūrō (“to swear an oath”). As a medieval office, via French jurat, via Occitan juré.
Adapted from the Wiktionary entry jurat (CC BY-SA 4.0).