no! it is not ante/post- MERIDIAN (a.m./p.m.). it's "MERIDIEM!!!!!"
meridian pertains to a map/globe's longitude in connection to the international date line.
meridiem is the latin term for noon or mid-day.
also, anti-meridian has nothing to do with a.m. it is the longitude 180 degrees east or west of the international dateline.
thank you. that is all.
what can i do? ^__^