a person employed in an apartment house, office building, school, etc., to clean the public areas, remove garbage, and do minor repairs; caretaker.
Archaic. a doorkeeper or porter.
verb (used without object)
to be employed as a janitor.

1575–85; < Latin jānitor doorkeeper, equivalent to jāni- (combining form of jānus doorway, covered passage) + -tor -tor

janitorial [jan-i-tawr-ee-uhl, -tohr-] , adjective
underjanitor, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
janitor (ˈdʒænɪtə)
1.  (Scot), (US), (Canadian) the caretaker of a building, esp a school
2.  chiefly (US), (Canadian) a person employed to clean and maintain a building, esp the public areas in a block of flats or office building; porter
[C17: from Latin: doorkeeper, from jānua door, entrance, from jānus covered way (compare Janus1); related to Latin īre to go]
fem n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1584, "an usher in a school, doorkeeper," from L. janua "door," from janus "arched passageway" (see Janus) + agent suffix -tor. Meaning "caretaker of a building" first recorded 1708.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People are required to have a high school diploma to be a janitor.
Steichen prepared for the shoot by having a janitor sit in for the magnate
  while he perfected the lighting.
Only one now has a full-time job, working as a janitor in a charter school.
Meanwhile, a club janitor learns that the biker, the club owner and another are
  murderous dope pushers.
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