Definify.com
Webster 1913 Edition
Affidavit
Afˊfi-da′vit
,Noun.
 (Law) 
A sworn statement in writing; a declaration in writing, signed and made upon oath before an authorized magistrate. 
Bouvier. 
Burrill.
 ☞ It is always made ex parte, and without cross-examination, and in this differs from a deposition. It is also applied to written statements made on affirmation. 
Syn. – Deposition. See 
Deposition
. Webster 1828 Edition
Affidavit
AFFIDA'VIT
,Noun.
  A declaration upon oath.  In the United States, more generally, a declaration in writing, signed by the party, and sworn to, before an authorized magistrate.