"exasecond" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "exa",
        "3": "second"
      },
      "expansion": "exa- + second",
      "name": "prefix"
    }
  ],
  "etymology_text": "exa- + second",
  "forms": [
    {
      "form": "exaseconds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "exasecond (plural exaseconds)",
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        {
          "kind": "other",
          "name": "English terms prefixed with exa-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Metrology",
          "orig": "en:Metrology",
          "parents": [
            "Applied sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
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            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
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            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An SI unit of time equal to 10¹⁸ seconds. Symbol: Es"
      ],
      "id": "en-exasecond-en-noun-DKcWfc3S",
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "time",
          "time#English"
        ],
        [
          "second",
          "second"
        ],
        [
          "Es",
          "Es"
        ]
      ],
      "raw_glosses": [
        "(metrology) An SI unit of time equal to 10¹⁸ seconds. Symbol: Es"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "exasecond"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "exa",
        "3": "second"
      },
      "expansion": "exa- + second",
      "name": "prefix"
    }
  ],
  "etymology_text": "exa- + second",
  "forms": [
    {
      "form": "exaseconds",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "exasecond (plural exaseconds)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "An SI unit of time equal to 10¹⁸ seconds. Symbol: Es"
      ],
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        ],
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        ],
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          "Es",
          "Es"
        ]
      ],
      "raw_glosses": [
        "(metrology) An SI unit of time equal to 10¹⁸ seconds. Symbol: Es"
      ],
      "topics": [
        "metrology"
      ]
    }
  ],
  "word": "exasecond"
}