A door-keeper; a porter. [1913 Webster]
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]

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OXFORD DICTIONARY

janitor, n.
1 a doorkeeper.
2 a caretaker of a building.

Derivative

janitorial adj.

Etymology

L f. janua door

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THESAURUS

janitor

air warden, attendant, caretaker, castellan, cerberus, char, charwoman, cleaner, cleaner-off, cleaner-up, cleaning lady, cleaning man, cleaning woman, concierge, conservator, curator, custodian, doorkeeper, doorman, forest ranger, game warden, gamekeeper, gatekeeper, governor, guardian, guardian angel, janitress, keeper, lifeguard, lifesaver, next friend, ostiary, porter, prochein ami, ranger, receptionist, shepherd, steward, usher, warden, warder

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ROGET THESAURUS

janitor

Stopper

N stopper, stopple, plug, cork, bung, spike, spill, stopcock, tap, rammer, ram, ramrod, piston, stop-gap, wadding, stuffing, padding, stopping, dossil, pledget, tompion, tourniquet, cover, valve, vent peg, spigot, slide valve, janitor, doorkeeper, porter, warder, beadle, cerberus, ostiary.

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