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to attest
01
to confirm or prove something true, often by providing evidence or testimony
Transitive: to attest to sth
Example
His honesty and integrity attest to his trustworthiness.
The glowing testimonials from satisfied customers attest to the quality of their service.
02
to confirm or verify something as true in an official capacity
Transitive: to attest sth
Example
She attested the document by signing as a witness.
The friend attested the signature on the letter as genuine.
03
to confirm or prove the existence of something, often a word or form, that is believed to have existed in a language
Transitive: to attest a form or word
Example
The word " computer " was first attested in the 20th century.
Linguists have attested the form of the verb in several ancient texts.

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