"material witness" meaning in English

{
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    {
      "form": "material witnesses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "material witness (plural material witnesses)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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            "All topics",
            "Fundamental"
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          "name": "People",
          "orig": "en:People",
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            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "A person with information alleged to be material concerning a criminal proceeding, and who therefore may be detained to insure their participation in such a proceeding."
      ],
      "id": "en-material_witness-en-noun-cfimEmmO",
      "links": [
        [
          "law",
          "law#English"
        ],
        [
          "material",
          "material"
        ],
        [
          "criminal",
          "criminal"
        ]
      ],
      "raw_glosses": [
        "(law) A person with information alleged to be material concerning a criminal proceeding, and who therefore may be detained to insure their participation in such a proceeding."
      ],
      "topics": [
        "law"
      ],
      "wikipedia": [
        "material witness"
      ]
    }
  ],
  "word": "material witness"
}

{
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    {
      "form": "material witnesses",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "material witness (plural material witnesses)",
      "name": "en-noun"
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  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "en:Law",
        "en:People"
      ],
      "glosses": [
        "A person with information alleged to be material concerning a criminal proceeding, and who therefore may be detained to insure their participation in such a proceeding."
      ],
      "links": [
        [
          "law",
          "law#English"
        ],
        [
          "material",
          "material"
        ],
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          "criminal"
        ]
      ],
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        "(law) A person with information alleged to be material concerning a criminal proceeding, and who therefore may be detained to insure their participation in such a proceeding."
      ],
      "topics": [
        "law"
      ],
      "wikipedia": [
        "material witness"
      ]
    }
  ],
  "word": "material witness"
}