praemunire facias UK /ˌpɹiː.mjʊˈnɪə.ɹi ˈfeɪ.ʃi.əs/US /ˌpɹi.mjəˈnɪ.ɹ.i ˈfeɪ.ʃi.əs/ noun1 •(historical) More fully writ of praemunire facias: a writ directing a sheriff to forewarn a person that they must appear before a court to answer a criminal charge of having brought a suit in or obeyed a foreign (especially papal) court or authority, thus challenging the supremacy of the Crown; a praemunire.