"inertial frame" meaning in English

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    {
      "form": "inertial frames",
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  "lang_code": "en",
  "pos": "noun",
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        {
          "word": "inertial frame of reference"
        }
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          "orig": "en:Physics",
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      ],
      "glosses": [
        "Short for inertial frame of reference."
      ],
      "id": "en-inertial_frame-en-noun-H2oChor3",
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          "physics",
          "physics"
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        [
          "inertial frame of reference",
          "inertial frame of reference#English"
        ]
      ],
      "raw_glosses": [
        "(physics) Short for inertial frame of reference."
      ],
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        "natural-sciences",
        "physical-sciences",
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  ],
  "word": "inertial frame"
}

{
  "forms": [
    {
      "form": "inertial frames",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "inertial frame (plural inertial frames)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "word": "inertial frame of reference"
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      "glosses": [
        "Short for inertial frame of reference."
      ],
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          "physics"
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        [
          "inertial frame of reference",
          "inertial frame of reference#English"
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        "(physics) Short for inertial frame of reference."
      ],
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        "physical-sciences",
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  "word": "inertial frame"
}