From Longman Dictionary of Contemporary Englishjanitorjan‧i‧tor /ˈdʒænɪtə $ -ər/ noun [countable] especially American EnglishBOSE someone whose job is to look after a school or other large building SYN caretaker British English
Examples from the Corpus
janitor• Born free in South Carolina in 1834, Turner refused to work alongside slaves, so he found work as a janitor.• The modern janitor is given that title for having the keys to all doors in a building.• Their work was so secret they had neither janitors nor secretaries.• No janitor had ever been at work here.• Poole and Bowman had often humorously referred to them-selves as caretakers or janitors aboard a ship that could really run itself.• He assumed that a porter or janitor was usually stationed there to be on call or to answer enquiries.• the school janitor• He was, like Aziz the janitor, definitely wearing one shoe and one slipper.• Back on the main road, Robert caught a glimpse of Aziz the janitor.Origin janitor (1500-1600) Latin janua “door” 