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English definition of “companion”

companion

noun [C] (BOOK)    /kəmˈpæn.jən/
used in the title of a type of book that gives you information on a particular subject or tells you how to do something: the Music Lover's CompanionKinds of books
(Definition of companion noun (BOOK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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