A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. (Cambridge Dictionary)
A sworn statement in writing made especially under oath or on affirmation before an authorised magistrate or officer. (Merriam – Webster)
An affidavit is a written statement which you swear is true and which may be used as evidence in a court of law. (Collins Dictionary)
A written statement confirmed by oath or affirmation, for use as evidence in court. (Oxford Dictionaries)
Preparing an affidavit. Family court of Australia.
The affidavit of complaint.
Affidavit and the law in India.
Affidavit of non- rental. City of Philadelphia Department of Licenses and Inspections.