"agonic line" meaning in English

{
  "forms": [
    {
      "form": "agonic lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "agonic line (plural agonic lines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Irish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Polish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Cartography",
          "orig": "en:Cartography",
          "parents": [
            "Geography",
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Navigation",
          "orig": "en:Navigation",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A line on a chart or map joining points of zero magnetic declination."
      ],
      "id": "en-agonic_line-en-noun-1BtEoDTX",
      "links": [
        [
          "cartography",
          "cartography"
        ],
        [
          "navigation",
          "navigation"
        ],
        [
          "magnetic declination",
          "magnetic declination"
        ]
      ],
      "qualifier": "navigation",
      "raw_glosses": [
        "(cartography, navigation) A line on a chart or map joining points of zero magnetic declination."
      ],
      "related": [
        {
          "word": "isogonal"
        },
        {
          "word": "isogon"
        }
      ],
      "synonyms": [
        {
          "tags": [
            "obsolete"
          ],
          "word": "line of no variation"
        }
      ],
      "topics": [
        "cartography",
        "geography",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "ga",
          "lang": "Irish",
          "sense": "a line on a chart or map joining points of zero magnetic declination",
          "tags": [
            "feminine"
          ],
          "word": "líne aindiallais"
        },
        {
          "code": "pl",
          "lang": "Polish",
          "sense": "a line on a chart or map joining points of zero magnetic declination",
          "tags": [
            "feminine"
          ],
          "word": "agona"
        }
      ]
    }
  ],
  "word": "agonic line"
}

{
  "forms": [
    {
      "form": "agonic lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "agonic line (plural agonic lines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "isogonal"
    },
    {
      "word": "isogon"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Irish translations",
        "Terms with Polish translations",
        "en:Cartography",
        "en:Navigation"
      ],
      "glosses": [
        "A line on a chart or map joining points of zero magnetic declination."
      ],
      "links": [
        [
          "cartography",
          "cartography"
        ],
        [
          "navigation",
          "navigation"
        ],
        [
          "magnetic declination",
          "magnetic declination"
        ]
      ],
      "qualifier": "navigation",
      "raw_glosses": [
        "(cartography, navigation) A line on a chart or map joining points of zero magnetic declination."
      ],
      "topics": [
        "cartography",
        "geography",
        "natural-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "obsolete"
      ],
      "word": "line of no variation"
    }
  ],
  "translations": [
    {
      "code": "ga",
      "lang": "Irish",
      "sense": "a line on a chart or map joining points of zero magnetic declination",
      "tags": [
        "feminine"
      ],
      "word": "líne aindiallais"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "a line on a chart or map joining points of zero magnetic declination",
      "tags": [
        "feminine"
      ],
      "word": "agona"
    },
    {
      "code": "pl",
      "lang": "Polish",
      "sense": "a line on a chart or map joining points of zero magnetic declination",
      "tags": [
        "feminine"
      ],
      "word": "agona"
    }
  ],
  "word": "agonic line"
}