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Definition of reference book noun from the Oxford Advanced Learner's Dictionary

reference book

noun
 
/ˈrefrəns bʊk/
 
/ˈrefrəns bʊk/
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  1. a book that contains facts and information, that you look at when you need to find out something particular
    • dictionaries, encyclopedias and other reference books
See reference book in the Oxford Advanced American Dictionary
given
adjective
 
 
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