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Definitions

authenticate

[aw-then-ti-keyt] / ɔˈθɛn tɪˌkeɪt /
VERB
establish as real, genuine
Synonyms
STRONGEST
attest corroborate substantiate validate verify
STRONG
accredit authorize certify confirm endorse guarantee justify prove vouch warrant
WEAK
bear out
Antonyms
STRONGEST
deny disprove reject
STRONG
contradict disapprove disavow discredit invalidate oppose repudiate

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"In this study we show how to authenticate a biomarker, verifying that a signal truly comes from life rather than contamination or non-biological chemistry," Shawar adds.

From Science Daily • Feb. 27, 2026

Nanos also said the sheriff's office had received a copy of a ransom note and was working with the FBI to authenticate it.

From BBC • Feb. 4, 2026

Official media has largely played down the protests but videos have flooded social media, many of which are difficult to authenticate, or have even been manipulated.

From Barron's • Jan. 2, 2026

Then I scan my fingerprint on a remote mounted next to my porcelain throne, which allows multiple people to authenticate their personal sessions.

From The Wall Street Journal • Oct. 26, 2025

Geri explained that he needed the director of the Uffizi to authenticate the painting.

From "The Mona Lisa Vanishes" by Nicholas Day