"Affidavit" is a legal English word meaning "sworn written statement". In its structure, it poses as the third person singular perfect tense of a Latin verb "affidare". However, I can find no reference to that verb in classical or medieval Latin resources. I know there is a modern Italian verb "affidare", but that doesn't explain the English use. Can anybody point me to anything that suggests that "affidavit" may have a more honourable origin than dog Latin? It's almost as though somebody wanted to create a Latin word to express "he faith'd".