The "m" elision (with the macron) is a standard orthographical device, and only for final "m". "-m" was very soft, even in Classical Latin; it functioned more l

The "m" elision (with the macron) is a standard orthographical device, and only for final "m". "-m" was very soft, even in Classical Latin; it functioned more like a vowel, and could be elided into following vowels. It was likely pronounced as a nasalisation of the preceding vowel sound, as in Portuguese today.