"задачник" meaning in Russian

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "задача",
        "3": "-ник"
      },
      "expansion": "задача (zadača) + -ник (-nik)",
      "name": "af"
    }
  ],
  "etymology_text": "задача (zadača) + -ник (-nik)",
  "forms": [
    {
      "form": "зада́чник",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "zadáčnik",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "зада́чника",
      "tags": [
        "genitive"
      ]
    },
    {
      "form": "зада́чники",
      "tags": [
        "nominative",
        "plural"
      ]
    },
    {
      "form": "зада́чников",
      "tags": [
        "genitive",
        "plural"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "declension",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "ru-noun-table",
      "source": "declension",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "velar-stem",
      "source": "declension",
      "tags": [
        "class"
      ]
    },
    {
      "form": "accent-a",
      "source": "declension",
      "tags": [
        "class"
      ]
    },
    {
      "form": "зада́чник",
      "roman": "zadáčnik",
      "source": "declension",
      "tags": [
        "nominative",
        "singular"
      ]
    },
    {
      "form": "зада́чники",
      "roman": "zadáčniki",
      "source": "declension",
      "tags": [
        "nominative",
        "plural"
      ]
    },
    {
      "form": "зада́чника",
      "roman": "zadáčnika",
      "source": "declension",
      "tags": [
        "genitive",
        "singular"
      ]
    },
    {
      "form": "зада́чников",
      "roman": "zadáčnikov",
      "source": "declension",
      "tags": [
        "genitive",
        "plural"
      ]
    },
    {
      "form": "зада́чнику",
      "roman": "zadáčniku",
      "source": "declension",
      "tags": [
        "dative",
        "singular"
      ]
    },
    {
      "form": "зада́чникам",
      "roman": "zadáčnikam",
      "source": "declension",
      "tags": [
        "dative",
        "plural"
      ]
    },
    {
      "form": "зада́чник",
      "roman": "zadáčnik",
      "source": "declension",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "зада́чники",
      "roman": "zadáčniki",
      "source": "declension",
      "tags": [
        "accusative",
        "plural"
      ]
    },
    {
      "form": "зада́чником",
      "roman": "zadáčnikom",
      "source": "declension",
      "tags": [
        "instrumental",
        "singular"
      ]
    },
    {
      "form": "зада́чниками",
      "roman": "zadáčnikami",
      "source": "declension",
      "tags": [
        "instrumental",
        "plural"
      ]
    },
    {
      "form": "зада́чнике",
      "roman": "zadáčnike",
      "source": "declension",
      "tags": [
        "prepositional",
        "singular"
      ]
    },
    {
      "form": "зада́чниках",
      "roman": "zadáčnikax",
      "source": "declension",
      "tags": [
        "plural",
        "prepositional"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "зада́чник"
      },
      "expansion": "зада́чник • (zadáčnik) m inan (genitive зада́чника, nominative plural зада́чники, genitive plural зада́чников)",
      "name": "ru-noun+"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian nouns with accent pattern a",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Russian terms suffixed with -ник",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "book of problems (a book that contains mathematical problems)"
      ],
      "id": "en-задачник-ru-noun-0v9KN772",
      "links": [
        [
          "book",
          "book"
        ],
        [
          "problems",
          "problem"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[zɐˈdat͡ɕnʲɪk]"
    }
  ],
  "word": "задачник"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ru",
        "2": "задача",
        "3": "-ник"
      },
      "expansion": "задача (zadača) + -ник (-nik)",
      "name": "af"
    }
  ],
  "etymology_text": "задача (zadača) + -ник (-nik)",
  "forms": [
    {
      "form": "зада́чник",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "zadáčnik",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "зада́чника",
      "tags": [
        "genitive"
      ]
    },
    {
      "form": "зада́чники",
      "tags": [
        "nominative",
        "plural"
      ]
    },
    {
      "form": "зада́чников",
      "tags": [
        "genitive",
        "plural"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "declension",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "ru-noun-table",
      "source": "declension",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "velar-stem",
      "source": "declension",
      "tags": [
        "class"
      ]
    },
    {
      "form": "accent-a",
      "source": "declension",
      "tags": [
        "class"
      ]
    },
    {
      "form": "зада́чник",
      "roman": "zadáčnik",
      "source": "declension",
      "tags": [
        "nominative",
        "singular"
      ]
    },
    {
      "form": "зада́чники",
      "roman": "zadáčniki",
      "source": "declension",
      "tags": [
        "nominative",
        "plural"
      ]
    },
    {
      "form": "зада́чника",
      "roman": "zadáčnika",
      "source": "declension",
      "tags": [
        "genitive",
        "singular"
      ]
    },
    {
      "form": "зада́чников",
      "roman": "zadáčnikov",
      "source": "declension",
      "tags": [
        "genitive",
        "plural"
      ]
    },
    {
      "form": "зада́чнику",
      "roman": "zadáčniku",
      "source": "declension",
      "tags": [
        "dative",
        "singular"
      ]
    },
    {
      "form": "зада́чникам",
      "roman": "zadáčnikam",
      "source": "declension",
      "tags": [
        "dative",
        "plural"
      ]
    },
    {
      "form": "зада́чник",
      "roman": "zadáčnik",
      "source": "declension",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "зада́чники",
      "roman": "zadáčniki",
      "source": "declension",
      "tags": [
        "accusative",
        "plural"
      ]
    },
    {
      "form": "зада́чником",
      "roman": "zadáčnikom",
      "source": "declension",
      "tags": [
        "instrumental",
        "singular"
      ]
    },
    {
      "form": "зада́чниками",
      "roman": "zadáčnikami",
      "source": "declension",
      "tags": [
        "instrumental",
        "plural"
      ]
    },
    {
      "form": "зада́чнике",
      "roman": "zadáčnike",
      "source": "declension",
      "tags": [
        "prepositional",
        "singular"
      ]
    },
    {
      "form": "зада́чниках",
      "roman": "zadáčnikax",
      "source": "declension",
      "tags": [
        "plural",
        "prepositional"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "зада́чник"
      },
      "expansion": "зада́чник • (zadáčnik) m inan (genitive зада́чника, nominative plural зада́чники, genitive plural зада́чников)",
      "name": "ru-noun+"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Russian 3-syllable words",
        "Russian entries with incorrect language header",
        "Russian inanimate nouns",
        "Russian lemmas",
        "Russian links with redundant wikilinks",
        "Russian masculine nouns",
        "Russian nouns",
        "Russian nouns with accent pattern a",
        "Russian terms suffixed with -ник",
        "Russian terms with IPA pronunciation",
        "Russian velar-stem masculine-form accent-a nouns",
        "Russian velar-stem masculine-form nouns"
      ],
      "glosses": [
        "book of problems (a book that contains mathematical problems)"
      ],
      "links": [
        [
          "book",
          "book"
        ],
        [
          "problems",
          "problem"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[zɐˈdat͡ɕnʲɪk]"
    }
  ],
  "word": "задачник"
}