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
Testify is a synonym for certify in affirm topic. In some cases you can use "Testify" instead a verb "Certify", when it comes to topics like speech, confirm, attest, declare as true. popular alternative
Testify
Testify verb - To make a solemn declaration under oath for the purpose of establishing a fact.
Mutual synonyms
Cite this Source
Testify and Certify. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/certify/testify
Certify & Testify. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/certify/testify>.
Testify or Certify. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/certify/testify.
Google Ngram Viewer shows how "certify" and "testify" have occurred on timeline