"freestream" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "free",
        "3": "stream"
      },
      "expansion": "free + stream",
      "name": "compound"
    }
  ],
  "etymology_text": "From free + stream.",
  "forms": [
    {
      "form": "freestreams",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "freestream (plural freestreams)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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        {
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      ],
      "glosses": [
        "The air far upstream of an aerodynamic body, i.e. before the body has a chance to deflect, slow down or compress the air."
      ],
      "id": "en-freestream-en-noun-81xnIitL",
      "links": [
        [
          "air",
          "air"
        ],
        [
          "upstream",
          "upstream"
        ],
        [
          "aerodynamic",
          "aerodynamic"
        ],
        [
          "body",
          "body"
        ],
        [
          "deflect",
          "deflect"
        ],
        [
          "compress",
          "compress"
        ]
      ]
    }
  ],
  "word": "freestream"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "free",
        "3": "stream"
      },
      "expansion": "free + stream",
      "name": "compound"
    }
  ],
  "etymology_text": "From free + stream.",
  "forms": [
    {
      "form": "freestreams",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "freestream (plural freestreams)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English entries with incorrect language header",
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      ],
      "glosses": [
        "The air far upstream of an aerodynamic body, i.e. before the body has a chance to deflect, slow down or compress the air."
      ],
      "links": [
        [
          "air",
          "air"
        ],
        [
          "upstream",
          "upstream"
        ],
        [
          "aerodynamic",
          "aerodynamic"
        ],
        [
          "body",
          "body"
        ],
        [
          "deflect",
          "deflect"
        ],
        [
          "compress",
          "compress"
        ]
      ]
    }
  ],
  "word": "freestream"
}