"bulletin board service" meaning in English

{
  "forms": [
    {
      "form": "bulletin board services",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "bulletin board service"
      },
      "expansion": "bulletin board service (plural bulletin board services)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1984 September 3, Judith Walters von Alten, “Color for Bulletin Boards”, in InfoWorld, volume 6, number 6, InfoWorld Media Group, →ISSN, page 35",
          "text": "Some bulletin board subscribers can now dial up displays for their IBM PC or PC XT in living color—and see the results in less than a second. All they need is a color monitor, a color graphics card, and access to PC Canada, the first bulletin board service to offer an on-line graphics and color program.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of bulletin board system"
      ],
      "id": "en-bulletin_board_service-en-noun-x8IVrd5Z",
      "links": [
        [
          "bulletin board system",
          "bulletin board system#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "bulletin board system"
        }
      ]
    }
  ],
  "word": "bulletin board service"
}

{
  "forms": [
    {
      "form": "bulletin board services",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "bulletin board service"
      },
      "expansion": "bulletin board service (plural bulletin board services)",
      "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"
      ],
      "examples": [
        {
          "ref": "1984 September 3, Judith Walters von Alten, “Color for Bulletin Boards”, in InfoWorld, volume 6, number 6, InfoWorld Media Group, →ISSN, page 35",
          "text": "Some bulletin board subscribers can now dial up displays for their IBM PC or PC XT in living color—and see the results in less than a second. All they need is a color monitor, a color graphics card, and access to PC Canada, the first bulletin board service to offer an on-line graphics and color program.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of bulletin board system"
      ],
      "links": [
        [
          "bulletin board system",
          "bulletin board system#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "bulletin board system"
        }
      ]
    }
  ],
  "word": "bulletin board service"
}