"coefficient of restitution" meaning in English

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  "forms": [
    {
      "form": "coefficients of restitution",
      "tags": [
        "plural"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
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      ],
      "glosses": [
        "Ratio of the final to the initial relative velocity between two objects after they collide"
      ],
      "id": "en-coefficient_of_restitution-en-noun-fFXbb5Bs",
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          "physics",
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        "(physics) Ratio of the final to the initial relative velocity between two objects after they collide"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "coefficient of restitution"
      ]
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  "word": "coefficient of restitution"
}

{
  "forms": [
    {
      "form": "coefficients of restitution",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
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      "expansion": "coefficient of restitution (plural coefficients of restitution)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "Ratio of the final to the initial relative velocity between two objects after they collide"
      ],
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          "physics",
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      "raw_glosses": [
        "(physics) Ratio of the final to the initial relative velocity between two objects after they collide"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
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        "coefficient of restitution"
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  ],
  "word": "coefficient of restitution"
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