"centre of gravity" meaning in English

{
  "forms": [
    {
      "form": "centres of gravity",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "centre of gravity (plural centres of gravity)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "center of gravity"
        }
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          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
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          "parents": [],
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        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "British and Canada standard spelling of center of gravity."
      ],
      "id": "en-centre_of_gravity-en-noun-GSk0HDCt",
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        [
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        ]
      ],
      "raw_glosses": [
        "(physics) British and Canada standard spelling of center of gravity."
      ],
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        "UK",
        "alt-of",
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      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "centre of gravity"
}

{
  "forms": [
    {
      "form": "centres of gravity",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "centres of gravity"
      },
      "expansion": "centre of gravity (plural centres of gravity)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "center of gravity"
        }
      ],
      "categories": [
        "British English",
        "Canadian English",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from Proto-Indo-European",
        "English terms derived from the Proto-Indo-European root *gʷreh₂-",
        "en:Physics"
      ],
      "glosses": [
        "British and Canada standard spelling of center of gravity."
      ],
      "links": [
        [
          "physics",
          "physics"
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      ],
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        "(physics) British and Canada standard spelling of center of gravity."
      ],
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      "topics": [
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  ],
  "word": "centre of gravity"
}