"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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "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 lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from fiction",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "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"
}