exceptingex‧cept‧ing /ɪkˈseptɪŋ/ preposition formal 
used to introduce the only thing or person in a group about which a statement is not true SYN except (for): 
O'Rourke answered all the questions excepting the last one.
used to introduce the only thing or person in a group about which a statement is not true SYN except (for): O'Rourke answered all the questions excepting the last one.