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Synonyms
au·then·ti·cate (ô-thĕńtĭ-kāt́)

transitive verb: -cat·ed, -cat·ing, -cates. 

To establish the authenticity of; prove genuine: a specialist who authenticated the antique samovar. See synonyms at confirm

derivatives

au·theńti·cátion
noun
au·theńti·cátor
noun