Attest
Attest verb - To declare (something) to be true or genuine.
Usage example: the appraiser attests that the lamp is indeed an original Tiffany
Certify
Certify verb - To declare (something) to be true or genuine.
Usage example: experts certified the letter as indeed having been written by Abraham Lincoln
Attest is a synonym for certify in affirm topic. You can use "Attest" instead a verb "Certify", if it concerns topics such as speech, verify, confirm, vouch. popular alternative
Mutual synonyms
Cite this Source
Certify and Attest. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/attest/certify
Attest & Certify. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/attest/certify>.
Certify or Attest. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/attest/certify.
Google Ngram Viewer shows how "attest" and "certify" have occurred on timeline