"message unit" meaning in English

{
  "forms": [
    {
      "form": "message units",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "message unit (plural message units)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Advertising",
          "orig": "en:Advertising",
          "parents": [
            "Business",
            "Marketing",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1996, William F. Arens, Jack J. Whidden, Contemporary Advertising, page 239:",
          "text": "The planner has to consider the nature of the advertising message: some simply require more time and space to explain. Competitive activity often dictates more message units.",
          "type": "quote"
        },
        {
          "ref": "2009, Federico Subervi-Velez, The Mass Media and Latino Politics, page 316:",
          "text": "The GOP candidate campaign also mentioned health care in 12.2 percent of their ads' message units (n=9) and education in 8.1 percent (n=6).",
          "type": "quote"
        }
      ],
      "glosses": [
        "An individual broadcasting slot, such as a single televised advertisement."
      ],
      "id": "en-message_unit-en-noun-n3Fn9NxC",
      "links": [
        [
          "advertising",
          "advertising#Noun"
        ],
        [
          "individual",
          "individual"
        ],
        [
          "broadcast",
          "broadcast"
        ],
        [
          "slot",
          "slot"
        ]
      ],
      "raw_glosses": [
        "(advertising) An individual broadcasting slot, such as a single televised advertisement."
      ],
      "topics": [
        "advertising",
        "business",
        "marketing"
      ]
    }
  ],
  "word": "message unit"
}

{
  "forms": [
    {
      "form": "message units",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "message unit (plural message units)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned",
        "en:Advertising"
      ],
      "examples": [
        {
          "ref": "1996, William F. Arens, Jack J. Whidden, Contemporary Advertising, page 239:",
          "text": "The planner has to consider the nature of the advertising message: some simply require more time and space to explain. Competitive activity often dictates more message units.",
          "type": "quote"
        },
        {
          "ref": "2009, Federico Subervi-Velez, The Mass Media and Latino Politics, page 316:",
          "text": "The GOP candidate campaign also mentioned health care in 12.2 percent of their ads' message units (n=9) and education in 8.1 percent (n=6).",
          "type": "quote"
        }
      ],
      "glosses": [
        "An individual broadcasting slot, such as a single televised advertisement."
      ],
      "links": [
        [
          "advertising",
          "advertising#Noun"
        ],
        [
          "individual",
          "individual"
        ],
        [
          "broadcast",
          "broadcast"
        ],
        [
          "slot",
          "slot"
        ]
      ],
      "raw_glosses": [
        "(advertising) An individual broadcasting slot, such as a single televised advertisement."
      ],
      "topics": [
        "advertising",
        "business",
        "marketing"
      ]
    }
  ],
  "word": "message unit"
}