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The Collaborative International Dictionary
Authenticating

Authenticate \Au*then"ti*cate\, v. t. [imp. & p. p. Authenticated; p. pr. & vb. n. Authenticating (?).] [Cf. LL. authenticare.]

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

    The king serves only as a notary to authenticate the choice of judges.
    --Burke.

  2. To prove authentic; to determine as real and true; as, to authenticate a portrait.
    --Walpole.

Wiktionary
authenticating

vb. (present participle of authenticate English)

Usage examples of "authenticating".

Judith and Holofernes and The Denial of Peter, as well as authenticating or condemning hundreds of others.

Armand and entrust him with something as delicate as authenticating a painting?