Oxford Dictionary English

    custodian

    noun
    noun
    BrE BrE//kʌˈstəʊdiən//
    ; NAmE NAmE//kʌˈstoʊdiən//
    People in schools, School life
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  1. 1a person who takes responsibility for taking care of or protecting something the museum’s custodians a self-appointed custodian of public morals
  2. 2 (North American English) (British English caretaker) (North American English also, Scottish English janitor) a person whose job is to take care of a building such as a school or a block of flats or an apartment building See related entries: People in schools, School life
    3.  Word Originlate 18th cent.: from custody, on the pattern of guardian.
See custodian in the Oxford Advanced American Dictionary
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