Synonyms of certify

certify

verb

ˈsər-tə-ˌfī 

1

as in to guarantee

to declare (something) to be true or genuine

experts certified the letter as indeed having been written by Abraham Lincoln

Synonyms & Similar Words

• guarantee
• affirm
• attest
• authenticate
• testify (to)
• witness
• assert
• vouch (for)
• avouch
• warrant
• vow
• aver
• profess
• avow

2

as in to enable

to give official or legal power to

certified her as a teacher

Synonyms & Similar Words

• enable
• authorize
• empower
• qualify
• license
• invest
• permit
• entitle
• allow
• warrant
• accredit
• approve
• charter
• endorse
• confirm
• vest
• affirm
• licence
• validate
• indorse
• commission
• sanction
• okay
• install
• initiate
• let
• induct
• OK
• inaugurate
• credential
• privilege
• clear
• instate
• swear in
• enfranchise

Antonyms & Near Antonyms

• disqualify
• prevent
• deny
• exclude
• stop
• discourage
• hinder
• impede
• inhibit
• disallow
• constrain
• obstruct
• shut out
• prohibit
• block
• ban
• hold back
• bar
• forbid
• enjoin
• disbar
• disfranchise
• veto
• disenfranchise
• outlaw
• proscribe
• interdict

3

as in to verify

to give evidence or testimony to the truth or factualness of

please bring in a doctor's note to certify that you were really sick

Synonyms & Similar Words

• verify
• confirm
• argue
• support
• validate
• prove
• authenticate
• attest
• corroborate
• vindicate
• bear out
• demonstrate
• substantiate
• witness
• affirm
• establish
• testify (to)
• guarantee
• reinforce
• declare
• document
• assert
• vouch (for)
• warrant
• profess
• aver
• back (up)
• avouch
• avow
• reenforce

Antonyms & Near Antonyms

• refute
• disprove
• rebut
• deny
• contradict
• challenge
• question
• gainsay
• disclaim
• disavow
• contest
• dispute

Synonym Chooser

How does the verb certify contrast with its synonyms?

Some common synonyms of certify are attest, vouch, and witness. While all these words mean "to testify to the truth or genuineness of something," certify usually applies to a written statement, especially one carrying a signature or seal.

certified that the candidate had met all requirements

When would attest be a good substitute for certify?

The meanings of attest and certify largely overlap; however, attest applies to oral or written testimony usually from experts or witnesses.

attested to the authenticity of the document

In what contexts can vouch take the place of certify?

In some situations, the words vouch and certify are roughly equivalent. However, vouch applies to one who testifies as a competent authority or a reliable person.

willing to vouch for her integrity

When could witness be used to replace certify?

Although the words witness and certify have much in common, witness applies to the subscribing of one's own name to a document as evidence of its genuineness.

witnessed the signing of the will

Example Sentences

Recent Examples of certify

Both Everlywell and fellow DTC brand Thorne note that the laboratories used to test their samples are certified through the Clinical Laboratory Improvement Amendments (CLIA), which falls under the regulation of the Centers for Medicare & Medicaid Services (CMS). —Sara Braun, Sacbee.com, 17 Oct. 2025

Nearly every element—from the insulating fill to the lining and sleek outer shell—is Bluesign certified, PFAS-free and re-engineered for recovery. —Alexandra Harrell, Sourcing Journal, 16 Oct. 2025

On Tuesday, after the state certified Grijalva's election results, Arizona Attorney General Kris Mayes threatened legal action to try to force the oath of office. —Claudia Grisales, NPR, 16 Oct. 2025

Released during the commercial heyday of heavy metal, the album was certified gold and relaunched Frehley’s career, although tours with Iron Maiden and Alice Cooper ended early, reportedly over money issues; also, his sobriety did not last. —Jem Aswad, Variety, 16 Oct. 2025