Pace as well as being a noun and a verb, both related to walking, is also a Latin word. When it is a Latin word, it should properly be italicised (pace), and both syllables should be pronounced: 'pah-tshay', IPA: /'pɑː tʃɛ/. It is an inflection - the ablative - of the noun pax, which means 'peace'. In academic English, it is used as a polite way of acknowledging disagreement: it could be translated as 'with peace [towards]', and is always followed by the name of the person, or book etc, with whom one is disagreeing. "This seems inherently improbable, pace the many distinguished scholars who have argued for it." It is not much used outside academic English.