What does "authenticate" mean?

To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit.

What is a synonym for "authenticate"?

Common synonyms include: certify, accept, accredit, affirm, amen, approve.

Pronounced //ɒˈθɛn.tɪ.keɪt//.

//ɒˈθɛn.tɪ.keɪt// adj, verb

adj, verb ·Moderate ·College level

Verb

1
To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit. transitive
2
establish the authenticity of something wordnet
3
To prove authentic; to determine as real and true. transitive
"He didn’t manage to authenticate the portrait: it’s probably a fake."