PRIMA FACIE

(Latin) A legal presumption which means "on the face of it" or "at first sight". Law-makers will often use this device to establish that if a certain set of facts are proven, then another fact is established prima facie. For example, proof of mailing a letter is prima facie proof that it was received by the person to whom it was addressed and will accepted as such by a court unless proven otherwise. Other situations may require a prima facie case before proceeding to another step in the judicial process so that you would have to at least prove then that at first glance, there appears to be a case.