"open-book" meaning in English

{
  "antonyms": [
    {
      "word": "closed-book"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "open-book (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Education",
          "orig": "en:Education",
          "parents": [
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "open-notes"
        },
        {
          "word": "take-home"
        }
      ],
      "glosses": [
        "Designating exams in which specified external resources, potentially including textbooks, glossaries, study notes, calculators, etc. may be used."
      ],
      "id": "en-open-book-en-adj-0V5eEzrt",
      "links": [
        [
          "education",
          "education"
        ],
        [
          "exam",
          "exam#English"
        ],
        [
          "external",
          "external#English"
        ],
        [
          "resource",
          "resource#English"
        ],
        [
          "textbook",
          "textbook#English"
        ],
        [
          "glossaries",
          "glossary#English"
        ],
        [
          "study",
          "study#English"
        ],
        [
          "note",
          "note#English"
        ],
        [
          "calculator",
          "calculator#English"
        ]
      ],
      "raw_glosses": [
        "(education) Designating exams in which specified external resources, potentially including textbooks, glossaries, study notes, calculators, etc. may be used."
      ],
      "synonyms": [
        {
          "word": "open book"
        }
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "education"
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "sense": "referring to certain exams",
          "word": "開卷"
        },
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "kāijuàn",
          "sense": "referring to certain exams",
          "word": "开卷"
        },
        {
          "code": "fi",
          "english": "open-book exam",
          "lang": "Finnish",
          "sense": "referring to certain exams",
          "word": "aineistokoe"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "referring to certain exams",
          "word": "jossa saa käyttää omia materiaaleja"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "referring to certain exams",
          "word": "à cours ouvert"
        },
        {
          "code": "ko",
          "lang": "Korean",
          "roman": "opeunbuk",
          "sense": "referring to certain exams",
          "word": "오픈북"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "referring to certain exams",
          "tags": [
            "masculine"
          ],
          "word": "egzamin z notatkami"
        }
      ]
    }
  ],
  "word": "open-book"
}

{
  "antonyms": [
    {
      "word": "closed-book"
    }
  ],
  "coordinate_terms": [
    {
      "word": "open-notes"
    },
    {
      "word": "take-home"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "open-book (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English uncomparable adjectives",
        "Mandarin terms with redundant transliterations",
        "en:Education"
      ],
      "glosses": [
        "Designating exams in which specified external resources, potentially including textbooks, glossaries, study notes, calculators, etc. may be used."
      ],
      "links": [
        [
          "education",
          "education"
        ],
        [
          "exam",
          "exam#English"
        ],
        [
          "external",
          "external#English"
        ],
        [
          "resource",
          "resource#English"
        ],
        [
          "textbook",
          "textbook#English"
        ],
        [
          "glossaries",
          "glossary#English"
        ],
        [
          "study",
          "study#English"
        ],
        [
          "note",
          "note#English"
        ],
        [
          "calculator",
          "calculator#English"
        ]
      ],
      "raw_glosses": [
        "(education) Designating exams in which specified external resources, potentially including textbooks, glossaries, study notes, calculators, etc. may be used."
      ],
      "tags": [
        "not-comparable"
      ],
      "topics": [
        "education"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "open book"
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "sense": "referring to certain exams",
      "word": "開卷"
    },
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "kāijuàn",
      "sense": "referring to certain exams",
      "word": "开卷"
    },
    {
      "code": "fi",
      "english": "open-book exam",
      "lang": "Finnish",
      "sense": "referring to certain exams",
      "word": "aineistokoe"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "referring to certain exams",
      "word": "jossa saa käyttää omia materiaaleja"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "referring to certain exams",
      "word": "à cours ouvert"
    },
    {
      "code": "ko",
      "lang": "Korean",
      "roman": "opeunbuk",
      "sense": "referring to certain exams",
      "word": "오픈북"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "referring to certain exams",
      "tags": [
        "masculine"
      ],
      "word": "egzamin z notatkami"
    }
  ],
  "word": "open-book"
}