What is the definition of "affidavit"?

The correct definition of "affidavit" is a written statement confirmed by oath. An affidavit is a legal document in which an individual makes a sworn declaration of facts, often used as evidence in legal proceedings. The person making the affidavit, known as the affiant, must provide their statement voluntarily and under penalty of perjury, affirming that the contents are truthful to the best of their knowledge. This formal declaration is typically signed in the presence of a notary public or another authorized official to verify the affiant's identity and ensure the oath is duly administered.

The other options do not accurately represent the notion of an affidavit; a document used for immigration fees doesn't have any bearing on a sworn statement, a letter from an attorney pertains more to legal advice or representation rather than a formal declaration made under oath, and a list of references is merely a compilation of contacts used for recommendations, lacking any legal affirmation.