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janitor (n.)

1580s, "an usher in a school," later "doorkeeper" (1620s), from Latin ianitor "doorkeeper, porter," from ianua "door, entrance, gate," from ianus "arched passageway, arcade" (see Janus) + agent suffix -tor. Meaning "caretaker of a building, man employed to see that rooms are kept clean and in order" first recorded 1708. Fem. forms were janitress (1806), janitrix (1818).

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Definitions of janitor

janitor (n.)
someone employed to clean and maintain a building;
From wordnet.princeton.edu