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English definition of “primer”

primer

noun [C] (BOOK)    /ˈpraɪ.mər/ US  /-mɚ/ old-fashioned
a small book containing basic facts about a subject, used especially when you are beginning to learn about that subjectReference books
(Definition of primer noun (BOOK) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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