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Definition of janitor noun from the Oxford Advanced Learner's Dictionary

janitor

noun
 
/ˈdʒænɪtə(r)/
 
/ˈdʒænɪtər/
(North American English, Scottish English)
(North American English also custodian)
(British English caretaker)
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  1. a person whose job is to take care of a building such as a school or a block of flats or an apartment buildingTopics Educationc2, Jobsc2
    Word Originmid 16th cent.: from Latin, from janua ‘door’.
See janitor in the Oxford Advanced American Dictionary

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