When you authenticate something, you establish that it’s the real thing. If you authenticate a painting, for example, you’re sure that it's an original work, not a copy.

The verb authenticate came into English in the seventeenth century by way of the Latin word authenticat-, meaning “established as valid.” You’ve probably heard it to mean that a valuable item, like a diamond or a rare vase, is genuine. But not everything that has to be authenticated is worth a lot of money. For example, experts authenticate evidence in an investigation and you authenticate your identity to gain access to your email account.

Definitions of authenticate

v establish the authenticity of something

obtain probate of
Type of:
attest, certify, demonstrate, evidence, manifest
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes

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