"cool medium" meaning in English

{
  "etymology_text": "See hot medium.",
  "forms": [
    {
      "form": "cool media",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cool media"
      },
      "expansion": "cool medium (plural cool media)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "hot medium"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Any medium that is relatively poor in sensory data (e.g. a book as opposed to a film) and thus requires significant involvement by the viewer, reader, etc. in order to be consumed."
      ],
      "id": "en-cool_medium-en-noun-2dFrp5tk"
    }
  ],
  "word": "cool medium"
}

{
  "etymology_text": "See hot medium.",
  "forms": [
    {
      "form": "cool media",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "cool media"
      },
      "expansion": "cool medium (plural cool media)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "antonyms": [
        {
          "word": "hot medium"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms coined by Marshall McLuhan",
        "English terms with non-redundant non-automated sortkeys",
        "Pages with 1 entry"
      ],
      "glosses": [
        "Any medium that is relatively poor in sensory data (e.g. a book as opposed to a film) and thus requires significant involvement by the viewer, reader, etc. in order to be consumed."
      ]
    }
  ],
  "word": "cool medium"
}