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.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.