A superintendent is the overseer of an organization. The term superintendent is most often used to refer to someone who oversees a school district and — most importantly — decides when to declare a snow day.
A superintendent is also the caretaker for a building, like an apartment complex. The superintendent is the person to call with maintenance issues, such as a broken lock or clogged toilet. Used in this sense, the word is often shortened to "super." A superintendent was originally a church official who oversaw several churches in a district. The word comes from the Latin superintendere, which means to oversee.