LATIN PREFIX 3 3. ANTE(=before); POST(=after) antecedents ancestors; forefathers antedate 1. assign a date after the true date 2. come before in date; precede postdate assign a date after the true date ante meridiem before noon post meridiem after noon anteroom room placed before and forming an entrance to another; antechamber; waiting room postgraduate having to do with study after graduation ..