Notarize (verb)

To certify or authenticate a document by the signature and seal of a notary public.

Origin:

From latin notarius ("secretary, scribe") + -ize.

Examples:

1. You must notarize the document before it can be legally binding.
2. I had to notarize the signature before submitting the application.
3. The notary public notarized the document.
4. I notarized the power of attorney so it could be used in court.
5. I had to notarize the document before it could be used internationally.