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1. • • a subject about which you know or understand nothing: closed book to I'm afraid physics will always be a closed book to me.
     dictionary.cambridge.org/dictionary/english/closed-book

     CLOSED BOOK | English meaning - Cambridge Dictionary

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   What does a closed book Mean?

   • See full affiliate disclosure. Meaning of Idiom 'A Closed Book' A closed book is someone or something about which you know nothing or which you do not understand; a secret or mystery; a subject that someone does not want to talk about or be asked about. [note]Ayto, John.

   Closed Book, a | Idioms Online

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   What does it mean to 'hit a closed book'?

   • 1. A closed book means something that is very difficult to understand. Example: Physics is a closed book for Ashok. 2. To 'hit a book' means to study thoroughly. Example: You can score well, only if you hit the books day and night. 3. Can't make head or tails of it means unable to understand anything.

   Idioms and Phrases on Knowledge with examples

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   What does 'closed' mean in mathematics?

   • In mathematics, 'closure' refers to the possibilities of an operation on elements of a set. If something is closed, then it means that if we perform an operation on any two elements in the set, the result of the operation is also in the set.

   What is the closure of a totally bounded set of? - Quora

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   What is a “closed book” exam?

   • All exams are “closed book” and written in a supervised (or “proctored”) environment. Candidates can arrange a time, date, and location that are convenient for their work and study schedule. To be successful, candidates must achieve a “pass.” Exam marks are reported only as “pass” or “fail.” (Each exam has its own pass mark.

   TICO Manual Pages 1-50 - Flip PDF Download - FlipHTML5

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   Are schools a closed book?

   • After all, a book remains a closed book just as much if you cannot open it as if you cannot read it. The real nature of those dealings is a closed book for most of us. At one time schools were a closed book. They are certainly a closed book to me. Indeed, the sea affair is a closed book to the average citizen.

   CLOSED BOOK | English meaning - Cambridge Dictionary

   dictionary.cambridge.org/dictionary/english/closed-book

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   Is science considered a closed book?

   • Science is often perceived as a closed book for many people, who may find it boring or difficult in school or consider it irrelevant to their lives. However, it is not a closed book for everyone, as some may find it fascinating and gain a deep understanding of it.

   CLOSED BOOK definition and meaning | Collins English Dictionary

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3. dictionary.cambridge.org › english › closed-bookCLOSED BOOK | English meaning - Cambridge Dictionary

   dictionary.cambridge.org › english › closed-book

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   a subject about which you know or understand nothing: closed book to I'm afraid physics will always be a closed book to me. Synonyms. enigma. mystery. secret. SMART Vocabulary: related words and phrases. Difficult to understand. abstrusely. ambiguity. ambiguously. esoterically. fathomlessly. garble. get it into your thick head idiom. labyrinthine.

   • English (US)

     CLOSED BOOK meaning: 1. a subject about which you know or...

   • Znaczenie Closed Book, Definicja W Cambridge English Dictionary

     closed book definicja: 1. a subject about which you know or...

   • Translate to Traditional Chinese

     CLOSED BOOK translate: 一無所知的學科，完全不懂的學科. Learn more in the...

   • Translate to Mandarin Chinese

     CLOSED BOOK translate: 一无所知的学科，完全不懂的学科. Learn more in the...

   • Close-Up

     CLOSE-UP definition: 1. a photograph taken from a short...

   • Enigma

     ENIGMA definition: 1. something that is mysterious and seems...

   • Pronunciation in English

     closed book pronunciation. How to say closed book. Listen to...

   • Closed Bid

     CLOSED BID definition: 1. a system of choosing the best...

4. www.collinsdictionary.com › english › a-closed-bookDefinition of 'a closed book' - Collins Online Dictionary

   www.collinsdictionary.com › english › a-closed-book

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   If you say that someone or something is a closed book, you mean that you do not know anything about them. Frank Spriggs was a very able man but something of a closed book. Economics was a closed book to him.

5. www.ldoceonline.com › dictionary › a-closed-book-toa closed book (to somebody) | meaning of a closed book (to ...

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   a closed book (to somebody) meaning, definition, what is a closed book (to somebody): a subject or problem that someone does n...: Learn more.

6. www.collinsdictionary.com › english › closed-bookCLOSED BOOK definition and meaning - Collins Online Dictionary

   www.collinsdictionary.com › english › closed-book

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   closed book. 2 meanings: 1. something deemed unknown or incapable of being understood 2. a matter that has been finally concluded and admits.... Click for more definitions.

7. www.oxfordreference.com › abstract › 10Concise Oxford Dictionary of Mathematics - Oxford Reference

   www.oxfordreference.com › abstract › 10

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   6 days ago · With 3,000 entries ranging from Achilles paradox to zero matrix, it covers all commonly encountered terms and concepts from pure and applied mathematics and statistics, for example, linear algebra, optimisation, nonlinear equations, and differential equations.

8. www.mathsisfun.com › definitionsIllustrated Mathematics Dictionary - Math is Fun

   www.mathsisfun.com › definitions

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   Illustrated Mathematics Dictionary. Easy-to-understand definitions, with illustrations and links to further reading. Browse the definitions using the letters below, or use Search above.

9. www.ldoceonline.com › dictionary › a-closed-booka closed book | meaning of a closed book in Longman ...

   www.ldoceonline.com › dictionary › a-closed-book

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   a closed book meaning, definition, what is a closed book: a subject that you do not understand or ...: Learn more.