"molecular dynamics" meaning in English

{
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      "expansion": "molecular dynamics (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Physics",
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      ],
      "glosses": [
        "The study of the physical movement of collections of atoms and molecules as they interact"
      ],
      "id": "en-molecular_dynamics-en-noun-ddkguQ2m",
      "links": [
        [
          "physics",
          "physics"
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        [
          "movement",
          "movement"
        ],
        [
          "atom",
          "atom"
        ],
        [
          "molecule",
          "molecule"
        ]
      ],
      "raw_glosses": [
        "(physics) The study of the physical movement of collections of atoms and molecules as they interact"
      ],
      "tags": [
        "uncountable"
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      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
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      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Translations",
          "word": "molekyylidynamiikka"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "Molekulardynamik"
        },
        {
          "alt": "分子動力學",
          "code": "ko",
          "lang": "Korean",
          "roman": "bunjadong'yeokhak",
          "sense": "Translations",
          "word": "분자동역학"
        },
        {
          "code": "tr",
          "lang": "Turkish",
          "sense": "Translations",
          "word": "moleküler dinamik"
        }
      ],
      "wikipedia": [
        "molecular dynamics"
      ]
    }
  ],
  "word": "molecular dynamics"
}

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      "expansion": "molecular dynamics (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Physics"
      ],
      "glosses": [
        "The study of the physical movement of collections of atoms and molecules as they interact"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "movement",
          "movement"
        ],
        [
          "atom",
          "atom"
        ],
        [
          "molecule",
          "molecule"
        ]
      ],
      "raw_glosses": [
        "(physics) The study of the physical movement of collections of atoms and molecules as they interact"
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
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      "wikipedia": [
        "molecular dynamics"
      ]
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  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Translations",
      "word": "molekyylidynamiikka"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "Molekulardynamik"
    },
    {
      "alt": "分子動力學",
      "code": "ko",
      "lang": "Korean",
      "roman": "bunjadong'yeokhak",
      "sense": "Translations",
      "word": "분자동역학"
    },
    {
      "code": "tr",
      "lang": "Turkish",
      "sense": "Translations",
      "word": "moleküler dinamik"
    }
  ],
  "word": "molecular dynamics"
}