Affidavit refers to a written promise, and its Latin roots connect it to another kind of promise in English. 4. Write the case Index Number. 5.Enter the county where the affidavit is notarized. 6. Find definitions for court-related terms and phrases here, organized in alphabetical and numerical order. A written statement that someone makes after promising officially to tell the truth. An affidavit can be used as proof in a law court. "ss." appears like a sentinel after the name of a Massachusetts county in the caption of a pleading or at the commencement of a notary's acknowledgment. This form is required when adding a Springing Power of Attorney when the Springing Power of Attorney is over two years old, or when changing a registration. An affidavit is a statement made under oath, claiming that a fact or set of facts is true to the best of the "affiant's" knowledge. Here you will find forms that are used statewide in Washington Courts.