"significant wave height" meaning in English

{
  "forms": [
    {
      "form": "significant wave heights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "significant wave height (plural significant wave heights)",
      "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": "topical",
          "langcode": "en",
          "name": "Nautical",
          "orig": "en:Nautical",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A standardized measure of trough-to-crest wave height calculated for the needs of seafarers; exact mathematical definition has varied over time and currently it is defined as four times the standard deviation of the surface elevation."
      ],
      "id": "en-significant_wave_height-en-noun-q7VUXy7t",
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "trough",
          "trough"
        ],
        [
          "crest",
          "crest"
        ],
        [
          "seafarers",
          "seafarer"
        ],
        [
          "standard deviation",
          "standard deviation"
        ]
      ],
      "qualifier": "oceanographics",
      "raw_glosses": [
        "(oceanographics, nautical) A standardized measure of trough-to-crest wave height calculated for the needs of seafarers; exact mathematical definition has varied over time and currently it is defined as four times the standard deviation of the surface elevation."
      ],
      "topics": [
        "nautical",
        "transport"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "measure of wave height",
          "word": "merkitsevä aallonkorkeus"
        },
        {
          "code": "nb",
          "lang": "Norwegian Bokmål",
          "sense": "measure of wave height",
          "tags": [
            "masculine"
          ],
          "word": "signifikant bølgehøyde"
        },
        {
          "code": "nn",
          "lang": "Norwegian Nynorsk",
          "sense": "measure of wave height",
          "tags": [
            "feminine"
          ],
          "word": "signifikant bølgjehøgd"
        }
      ],
      "wikipedia": [
        "significant wave height"
      ]
    }
  ],
  "word": "significant wave height"
}

{
  "forms": [
    {
      "form": "significant wave heights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "significant wave height (plural significant wave heights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Nautical"
      ],
      "glosses": [
        "A standardized measure of trough-to-crest wave height calculated for the needs of seafarers; exact mathematical definition has varied over time and currently it is defined as four times the standard deviation of the surface elevation."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "trough",
          "trough"
        ],
        [
          "crest",
          "crest"
        ],
        [
          "seafarers",
          "seafarer"
        ],
        [
          "standard deviation",
          "standard deviation"
        ]
      ],
      "qualifier": "oceanographics",
      "raw_glosses": [
        "(oceanographics, nautical) A standardized measure of trough-to-crest wave height calculated for the needs of seafarers; exact mathematical definition has varied over time and currently it is defined as four times the standard deviation of the surface elevation."
      ],
      "topics": [
        "nautical",
        "transport"
      ],
      "wikipedia": [
        "significant wave height"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "measure of wave height",
      "word": "merkitsevä aallonkorkeus"
    },
    {
      "code": "nb",
      "lang": "Norwegian Bokmål",
      "sense": "measure of wave height",
      "tags": [
        "masculine"
      ],
      "word": "signifikant bølgehøyde"
    },
    {
      "code": "nn",
      "lang": "Norwegian Nynorsk",
      "sense": "measure of wave height",
      "tags": [
        "feminine"
      ],
      "word": "signifikant bølgjehøgd"
    }
  ],
  "word": "significant wave height"
}