To obtain a marriage license in Los Angeles County both parties must be present together and provide "Proof of Identity" and age documents. An affidavit is a written statement made under oath that is typically used in legal proceedings.Learn their purpose, when to use, and how to write. Affidavit definition: . See examples of AFFIDAVIT used in a sentence. An affidavit is a written statement, sworn to be true, that can be used as evidence in legal proceedings. It refers to the financial expenses incurred on the legal document that attests to a marriage between two individuals in the United States. Our office provides marriage licenses to couples getting married in the near future and even performs civil ceremonies for a small fee. Adjudicate – To exercise judicial authority in settling a case. Affidavit – A written statement given voluntarily and under oath.