Also means
to testify
Usage Note
Atestiguar means to bear witness or provide evidence of something; it is more formal than declarar and is used in legal, journalistic, and academic writing. Note the spelling: the gu before a is pronounced as a hard 'gw' — atestigua (3rd singular) keeps the gu intact before the a. Its noun counterpart is testimonio.
Examples
"El documento atestigua la autenticidad de la obra."
Natural Translation
The document attests to the authenticity of the work.

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