Notary (noun)

A public official authorized to certify legal documents and administer oaths.

Origin:

From latin notarius "a shorthand writer, notary".

Examples:

1. The notary witnessed the signing of the document.
2. The notary is authorized to certify legal documents.
3. The notary can administer oaths.
4. The notary's seal is required for the document to be legally binding.
5. The notary can certify translations.