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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.

Worse yet, these app-based ordering systems usually require a whole other login or download, forcing you to set up and authenticate an account that you’ll never use again after checkout.

From The Wall Street Journal • Mar. 26, 2026

"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

AFP was not immediately able to authenticate these soundbites.

From Barron's • Jan. 2, 2026

The BBC analysed the footage and was able to authenticate it as genuine.

From BBC • Aug. 28, 2025

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

From "The Mona Lisa Vanishes" by Nicholas Day

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.