"magnetic deviation" meaning in English

{
  "forms": [
    {
      "form": "magnetic deviations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "magnetic deviation (countable and uncountable, plural magnetic deviations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [],
      "examples": [
        {
          "ref": "1904, Ernest Rutherford, Radio-activity, Dover, published 2004, page 117",
          "text": "Preliminary experiments with radium of activity 1000 showed that it was very difficult to determine the magnetic deviation of the α rays.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Used other than figuratively or idiomatically: see magnetic, deviation."
      ],
      "id": "en-magnetic_deviation-en-noun-IBkqfEJN",
      "links": [
        [
          "magnetic",
          "magnetic#English"
        ],
        [
          "deviation",
          "deviation#English"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    },
    {
      "categories": [
        {
          "_dis": "4 96",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1998, John R. Ellis, Objectifying Real-Time Systems, page 483",
          "text": "This angular difference is the local magnetic deviation (Figure C.2). Navigation systems normally work relative to True North and therefore must remove the local magnetic deviation.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Magnetic declination."
      ],
      "id": "en-magnetic_deviation-en-noun-j~dKYN9O",
      "links": [
        [
          "Magnetic declination",
          "magnetic declination"
        ]
      ],
      "synonyms": [
        {
          "_dis1": "2 98",
          "sense": "magnetic declination",
          "word": "magnetic declination"
        },
        {
          "_dis1": "2 98",
          "sense": "magnetic declination",
          "word": "magnetic variation"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "magnetic deviation"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "English uncountable nouns"
  ],
  "forms": [
    {
      "form": "magnetic deviations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "magnetic deviation (countable and uncountable, plural magnetic deviations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1904, Ernest Rutherford, Radio-activity, Dover, published 2004, page 117",
          "text": "Preliminary experiments with radium of activity 1000 showed that it was very difficult to determine the magnetic deviation of the α rays.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Used other than figuratively or idiomatically: see magnetic, deviation."
      ],
      "links": [
        [
          "magnetic",
          "magnetic#English"
        ],
        [
          "deviation",
          "deviation#English"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1998, John R. Ellis, Objectifying Real-Time Systems, page 483",
          "text": "This angular difference is the local magnetic deviation (Figure C.2). Navigation systems normally work relative to True North and therefore must remove the local magnetic deviation.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Magnetic declination."
      ],
      "links": [
        [
          "Magnetic declination",
          "magnetic declination"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "magnetic declination",
      "word": "magnetic declination"
    },
    {
      "sense": "magnetic declination",
      "word": "magnetic variation"
    }
  ],
  "word": "magnetic deviation"
}