"mainspan" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "main",
        "3": "span"
      },
      "expansion": "main + span",
      "name": "compound"
    }
  ],
  "etymology_text": "main + span",
  "forms": [
    {
      "form": "mainspans",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mainspan (plural mainspans)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "2007 August 7, William J. Broad, “From Fresh Ideas and Better Steel, Safer Bridges”, in New York Times",
          "text": "The bridge has a cable-stayed mainspan.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The length of suspended roadway between the towers of a bridge."
      ],
      "id": "en-mainspan-en-noun-k5on5WGe",
      "links": [
        [
          "suspended",
          "suspended"
        ],
        [
          "roadway",
          "roadway"
        ],
        [
          "tower",
          "tower"
        ],
        [
          "bridge",
          "bridge"
        ]
      ]
    }
  ],
  "word": "mainspan"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "main",
        "3": "span"
      },
      "expansion": "main + span",
      "name": "compound"
    }
  ],
  "etymology_text": "main + span",
  "forms": [
    {
      "form": "mainspans",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "mainspan (plural mainspans)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2007 August 7, William J. Broad, “From Fresh Ideas and Better Steel, Safer Bridges”, in New York Times",
          "text": "The bridge has a cable-stayed mainspan.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The length of suspended roadway between the towers of a bridge."
      ],
      "links": [
        [
          "suspended",
          "suspended"
        ],
        [
          "roadway",
          "roadway"
        ],
        [
          "tower",
          "tower"
        ],
        [
          "bridge",
          "bridge"
        ]
      ]
    }
  ],
  "word": "mainspan"
}