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From The Collaborative International Dictionary of English v.0.48:
Janitor \Jan"i*tor\, n. [L., fr. janua a door.] 1. A door-keeper; a porter. [Archaic] [1913 Webster PJC] 2. One who is employed to care for a public building, or a building occupied for offices, suites of rooms, etc.; a caretaker; -- the duties may include removal of trash, cleaning of the rooms and public areas, and minor repairs. [1913 Webster PJC] Janitress