"反発係数" meaning in Japanese

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          "はん"
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          "係",
          "けい"
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          "数",
          "すう"
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  "word": "反発係数"
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      "expansion": "反発 (opposition) + 係数 (coefficient)",
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  "etymology_text": "反発 (opposition) + 係数 (coefficient)",
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          "はん"
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          "係",
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