af·fi·da·vit (plural af·fi·da·vits)
noun
written version of sworn
statement: a written declaration made on oath before
somebody authorized to administer oaths, usually setting out the
statement of a witness for court proceedings
[Late 16th century. From medieval
Latin, literally he or she has sworn, a form of affidare to
trust, affirm, from, ultimately, fidus faithful (source of
English fidelity).]