authenticate

Definitions

1. To establish the authenticity of; prove genuine: a specialist who authenticated the antique samovar. See Synonyms at confirm.
2. to establish as genuine or valid
3. to give authority or legal validity to
4. to establish as genuine.
5. to establish conclusively the authorship or origin of.
6. to make authoritative or valid.
7. verify, guarantee, warrant, authorize, certify, avouch All the antiques have been authenticated. verify invalidate, annul, render null and void
   verify
8. vouch for, confirm, endorse, validate, attest He authenticated the accuracy of various details.
9. To assure the certainty or validity of:attest, back (up), bear out, confirm, corroborate, evidence, justify, substantiate, testify (to), validate, verify, warrant.
10. To establish as true or genuine:bear out, confirm, corroborate, demonstrate, endorse, establish, evidence, prove, show, substantiate, validate, verify.

Equivalents

CEFR level