"zero G" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "zero gravity"
      },
      "expansion": "Clipping of zero gravity",
      "name": "clipping"
    }
  ],
  "etymology_text": "Clipping of zero gravity. Coined by British science fiction author Arthur C. Clarke (as \"zero 'g'\") in his 1952 novel Islands in the Sky.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "zero G (uncountable)",
      "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": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronautics",
          "orig": "en:Astronautics",
          "parents": [
            "Applied sciences",
            "Space",
            "Sciences",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Gravity",
          "orig": "en:Gravity",
          "parents": [
            "Acceleration",
            "Astrophysics",
            "Mechanics",
            "Physics",
            "Astronomy",
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Space",
          "orig": "en:Space",
          "parents": [
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Zero",
          "orig": "en:Zero",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "zero gravity"
      ],
      "id": "en-zero_G-en-noun-dBmV0wXK",
      "links": [
        [
          "zero gravity",
          "zero gravity"
        ]
      ],
      "synonyms": [
        {
          "word": "zero g"
        },
        {
          "word": "zero-g"
        },
        {
          "word": "zero-G"
        },
        {
          "word": "zero gee"
        },
        {
          "word": "zero-gee"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "Arthur C. Clarke",
        "Islands in the Sky"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈziɹoʊ d͡ʒiː/"
    }
  ],
  "word": "zero G"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "zero gravity"
      },
      "expansion": "Clipping of zero gravity",
      "name": "clipping"
    }
  ],
  "etymology_text": "Clipping of zero gravity. Coined by British science fiction author Arthur C. Clarke (as \"zero 'g'\") in his 1952 novel Islands in the Sky.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "zero G (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English clippings",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from fiction",
        "English terms with IPA pronunciation",
        "English terms with non-redundant non-automated sortkeys",
        "English uncountable nouns",
        "en:Astronautics",
        "en:Gravity",
        "en:Space",
        "en:Zero"
      ],
      "glosses": [
        "zero gravity"
      ],
      "links": [
        [
          "zero gravity",
          "zero gravity"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "Arthur C. Clarke",
        "Islands in the Sky"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈziɹoʊ d͡ʒiː/"
    }
  ],
  "synonyms": [
    {
      "word": "zero g"
    },
    {
      "word": "zero-g"
    },
    {
      "word": "zero-G"
    },
    {
      "word": "zero gee"
    },
    {
      "word": "zero-gee"
    }
  ],
  "word": "zero G"
}