"main frame" meaning in English

{
  "forms": [
    {
      "form": "main frames",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "main frame (plural main frames)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "mainframe"
        }
      ],
      "glosses": [
        "Alternative form of mainframe"
      ],
      "id": "en-main_frame-en-noun-G1Ze9m1G",
      "links": [
        [
          "mainframe",
          "mainframe#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "categories": [
        {
          "_dis": "9 57 34",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1951 March, “British Railways Standard \"Britannia\" Class 4-6-2 Locomotives”, in Railway Magazine, page 186",
          "text": "The main frames are of 1¼-in. thick plates spaced 3 ft. 2½ in. apart, the centre lines coinciding with the centre of the axlebox guide faces.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "the rigid frame upon which the moving parts of a machine are mounted; chassis"
      ],
      "id": "en-main_frame-en-noun-luVg6zg0",
      "links": [
        [
          "chassis",
          "chassis"
        ]
      ]
    },
    {
      "glosses": [
        "the widest structural frame located near the middle of a ship"
      ],
      "id": "en-main_frame-en-noun-Cyy1NsdI",
      "raw_glosses": [
        "(shipbuilding) the widest structural frame located near the middle of a ship"
      ],
      "related": [
        {
          "_dis1": "15 34 50",
          "word": "subframe"
        }
      ],
      "topics": [
        "business",
        "manufacturing",
        "shipbuilding"
      ]
    }
  ],
  "word": "main frame"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns"
  ],
  "forms": [
    {
      "form": "main frames",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "main frame (plural main frames)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "subframe"
    }
  ],
  "senses": [
    {
      "alt_of": [
        {
          "word": "mainframe"
        }
      ],
      "glosses": [
        "Alternative form of mainframe"
      ],
      "links": [
        [
          "mainframe",
          "mainframe#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1951 March, “British Railways Standard \"Britannia\" Class 4-6-2 Locomotives”, in Railway Magazine, page 186",
          "text": "The main frames are of 1¼-in. thick plates spaced 3 ft. 2½ in. apart, the centre lines coinciding with the centre of the axlebox guide faces.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "the rigid frame upon which the moving parts of a machine are mounted; chassis"
      ],
      "links": [
        [
          "chassis",
          "chassis"
        ]
      ]
    },
    {
      "glosses": [
        "the widest structural frame located near the middle of a ship"
      ],
      "raw_glosses": [
        "(shipbuilding) the widest structural frame located near the middle of a ship"
      ],
      "topics": [
        "business",
        "manufacturing",
        "shipbuilding"
      ]
    }
  ],
  "word": "main frame"
}