v. cer·ti·fied, cer·ti·fy·ing, cer·ti·fies
a. To confirm formally as true, accurate, or genuine: The police certified that a suspect had been arrested.
b. To guarantee as meeting a standard: butter that was certified Grade A.
2. To acknowledge in writing on the face of (a check) that the signature of the maker is genuine and that there are sufficient funds on deposit for its payment.
3. To issue a license or certificate to.
4. To declare to be in need of psychiatric treatment or confinement.
5. Archaic To inform positively; assure.
To vouch for the authenticity of something: certify to the facts.
[Middle English certifien, from Old French certifier, from Late Latin certificāre : Latin certus, certain; see CERTAIN + Latin -ficāre, -fy.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.