"decameter" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fr",
        "3": "décamètre"
      },
      "expansion": "French décamètre",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "deca",
        "3": "meter"
      },
      "expansion": "deca- + meter",
      "name": "prefix"
    }
  ],
  "etymology_text": "Borrowed from French décamètre. Equivalent to deca- + meter.",
  "forms": [
    {
      "form": "decameters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "decameter (plural decameters)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "decametre"
        }
      ],
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          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
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          "kind": "other",
          "name": "English terms prefixed with deca-",
          "parents": [],
          "source": "w"
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        {
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          "parents": [],
          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "SI units",
          "orig": "en:SI units",
          "parents": [
            "Units of measure",
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "US spelling of decametre"
      ],
      "id": "en-decameter-en-noun-QlcKroOP",
      "links": [
        [
          "decametre",
          "decametre#English"
        ]
      ],
      "tags": [
        "US",
        "alt-of"
      ]
    }
  ],
  "word": "decameter"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "fr",
        "3": "décamètre"
      },
      "expansion": "French décamètre",
      "name": "bor"
    },
    {
      "args": {
        "1": "en",
        "2": "deca",
        "3": "meter"
      },
      "expansion": "deca- + meter",
      "name": "prefix"
    }
  ],
  "etymology_text": "Borrowed from French décamètre. Equivalent to deca- + meter.",
  "forms": [
    {
      "form": "decameters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "decameter (plural decameters)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "decametre"
        }
      ],
      "categories": [
        "American English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
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        "English terms derived from French",
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      "glosses": [
        "US spelling of decametre"
      ],
      "links": [
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          "decametre",
          "decametre#English"
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      "tags": [
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  ],
  "word": "decameter"
}