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English definition of “textbook”

textbook

noun [C] uk   /ˈtekst.bʊk/ us  
A2 a book that contains detailed information about a subject for people who are studying that subject: a science textbook

textbook

adjective [before noun] uk   /ˈtekst.bʊk/ us  
(of an example of something) extremely good, or thought to be usual or typical: That was a textbook goal from Taylor. It was a textbook example of how to deal with the problem.
(Definition of textbook from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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