In refering to world title bouts, a fight for the interm
championship means:
A champion (for instance a WBA champion) hasn't defended his
title due to injury, so two contenders fight for the "interm" belt,
meaning that whoever wins (the interm champion) has to fight the
real champion when the "real" champion is fit and ready for
action.
Basically, it's just a money making think from the alphabet
boys.