#to authenticate

• To authenticate — To officially and legally establish, ascertain, or certify the originality, validity, or accuracy of a deed, document, or artwork; to invest a written instrument with authentic form through specific notarial or administrative procedures, granting it public authority and executory force.
• To authenticate — A less frequent or archaic lexicographical variant for the verb 'a autentica' or 'a autentifica'; the act of investment a written document with an authentic form, legalizing it, or certifying its legal validity and originality before a competent public authority.
• To authenticate — To officially demonstrate, certify, or recognize the originality, validity, or identity of something, a document, or a person; to perform the legal operations necessary before a notary to invest a written instrument with public authority. In computer science, it represents the action of a system verifying a user's credentials (password, biometrics) or the action of a user logging into a secure account.