"O2" meaning in English

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      "expansion": "O2",
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  "lang": "English",
  "lang_code": "en",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Medicine",
          "orig": "en:Medicine",
          "parents": [
            "Biology",
            "Sciences",
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          "_dis": "30 25 40 5",
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          "parents": [
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      ],
      "glosses": [
        "Both eyes."
      ],
      "id": "en-O2-en-symbol-YBZtI86v",
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "Both",
          "both"
        ],
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          "eye",
          "eye"
        ]
      ],
      "raw_glosses": [
        "(medicine) Both eyes."
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "O2"
}

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      "form": "the O2",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "_dis1": "0 0",
      "english": "original name of the building",
      "word": "Millennium Dome"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "place",
          "langcode": "en",
          "name": "Places in England",
          "orig": "en:Places in England",
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        {
          "kind": "place",
          "langcode": "en",
          "name": "Places in Greater London, England",
          "orig": "en:Places in Greater London, England",
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        },
        {
          "kind": "place",
          "langcode": "en",
          "name": "Places in London",
          "orig": "en:Places in London",
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            "Places",
            "Names",
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            "Proper nouns",
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          "source": "w"
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      ],
      "glosses": [
        "A large entertainment district in Greenwich, London."
      ],
      "id": "en-O2-en-name-VqwnQwM8",
      "links": [
        [
          "district",
          "district"
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          "Greenwich",
          "Greenwich#English"
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        [
          "London",
          "London#English"
        ]
      ]
    },
    {
      "glosses": [
        "The arena and concert venue at the center of said district."
      ],
      "id": "en-O2-en-name-Yu9hhHkR"
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  "synonyms": [
    {
      "_dis1": "0 0",
      "english": "official",
      "word": "The O2"
    }
  ],
  "word": "O2"
}

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    "English proper nouns",
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    "English terms spelled with numbers",
    "English uncountable nouns"
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  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "en:Medicine"
      ],
      "glosses": [
        "Both eyes."
      ],
      "links": [
        [
          "medicine",
          "medicine"
        ],
        [
          "Both",
          "both"
        ],
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          "eye",
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      "raw_glosses": [
        "(medicine) Both eyes."
      ],
      "topics": [
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "O2"
}

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    "English proper nouns",
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    "English uncountable nouns"
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    {
      "form": "the O2",
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  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "english": "original name of the building",
      "word": "Millennium Dome"
    }
  ],
  "senses": [
    {
      "categories": [
        "en:Places in England",
        "en:Places in Greater London, England",
        "en:Places in London"
      ],
      "glosses": [
        "A large entertainment district in Greenwich, London."
      ],
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        [
          "district",
          "district"
        ],
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          "Greenwich",
          "Greenwich#English"
        ],
        [
          "London",
          "London#English"
        ]
      ]
    },
    {
      "glosses": [
        "The arena and concert venue at the center of said district."
      ]
    }
  ],
  "synonyms": [
    {
      "english": "official",
      "word": "The O2"
    }
  ],
  "word": "O2"
}