There are multiple definitions - click on the translation that matches your context.

adnotacja na oświadczeniu z mocą przysięgi

rzeczownik

full

jurat

noun

Definitions of jurat

a statement on a sworn document or attached to a sworn document about when, where, and before whom it was sworn

The judge held that the language of the jurat was clear and unambiguous.

(largely historical) someone who has taken an oath or who does something under oath

The jurat did take an oath. NB This is an antiquated use of English.

(largely historical) a public official, especially a magistrate (=a civil officer with the authority to administer the law)

William's father, Thomas Harvey, was a jurat of Folkestone where he served the office of mayor in 1600.