[1] : The Collaborative International Dictionary of English v.0.48

babysitter \babysitter\, baby-sitter \baby-sitter\n.
   a person engaged to care for children when the parents are
   not home.

   syn: sitter
        wordnet 1.5

[2] : WordNet (r) 2.0

baby-sitter
     n : a person engaged to care for children when the parents are
         not home syn: babysitter, sitter
see also:
babysitter sitter 

[3] : WordNet (r) 2.0

babysitter
     n : a person engaged to care for children when the parents are
         not home syn: baby-sitter, sitter
see also:
baby-sitter sitter 

Babysitter >> B Words
Babysitter, definition of term: Babysitter
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