1.nounA person entrusted with the custody or care of something or someone; a caretaker or keeper.
"After their parents' death, their aunt became the children's custodian."
2.nounA janitor; a cleaner
"The custodian does such admirable work, deftly wielding a mop to keep our hallways and sidewalks free of buai pekpek left by people who chew betelnuts to be "cool" but don't even bother finding a rubbish bin or spit cup to dispose of the pekpek with."