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Affidavit
The term affidavit is Medieval Latin for “he has made an oath”. In the Legal English realm, it refers to a formal sworn statement of fact signed by a declarant (often called an affiant or deponent) and witnessed by an authorized official, such as a notary public. Affidavits are used, among other things, to gather evidence from witnesses who may not be available to testify in person before the court.
“The signed affidavit attested to the fact that the trademark had been in use for five years prior to the defendant’s adoption of the confusingly similar mark.”