"rolling introduction" meaning in English

{
  "etymology_text": "rolling + introduction",
  "forms": [
    {
      "form": "rolling introductions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rolling introduction (plural rolling introductions)",
      "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": "1972, Department of Transportation and Related Agencies Appropriations for 1973, United States Government Printing Office, page 431",
          "text": "But if that costs three quarters of a billion dollars or billion and a half dollars and you look around for the next one you are not going to do them all at once. I wouldn't say tracked air cushion vehicles will be in widespread use before the year 2000. It would be a rolling introduction, if you understand what I mean.",
          "type": "quotation"
        },
        {
          "ref": "2008, Paul Addison, Harriet Jones, editors, A Companion to Contemporary Britain, John Wiley & Sons",
          "text": "The Conservatives ... had introduced regionalized government executive offices in 1993 on the continental pattern, and John Prescott ... had promised a rolling introduction of regional assemblies along Welsh lines.",
          "type": "quotation"
        },
        {
          "ref": "2009, Dennis Kundisch, Daniel J. Veit, Tim Weitzel, Christoph Weinhardt, editors, Enterprise Applications and Services in the Finance Industry, Springer",
          "text": "Through the rolling introduction of the NYSE Hybrid Market the event dates in our analysis are scattered over almost four months.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A rollout staggered in time and space."
      ],
      "id": "en-rolling_introduction-en-noun-bFhTgGkv",
      "links": [
        [
          "rollout",
          "rollout"
        ]
      ]
    }
  ],
  "word": "rolling introduction"
}

{
  "etymology_text": "rolling + introduction",
  "forms": [
    {
      "form": "rolling introductions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rolling introduction (plural rolling introductions)",
      "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": "1972, Department of Transportation and Related Agencies Appropriations for 1973, United States Government Printing Office, page 431",
          "text": "But if that costs three quarters of a billion dollars or billion and a half dollars and you look around for the next one you are not going to do them all at once. I wouldn't say tracked air cushion vehicles will be in widespread use before the year 2000. It would be a rolling introduction, if you understand what I mean.",
          "type": "quotation"
        },
        {
          "ref": "2008, Paul Addison, Harriet Jones, editors, A Companion to Contemporary Britain, John Wiley & Sons",
          "text": "The Conservatives ... had introduced regionalized government executive offices in 1993 on the continental pattern, and John Prescott ... had promised a rolling introduction of regional assemblies along Welsh lines.",
          "type": "quotation"
        },
        {
          "ref": "2009, Dennis Kundisch, Daniel J. Veit, Tim Weitzel, Christoph Weinhardt, editors, Enterprise Applications and Services in the Finance Industry, Springer",
          "text": "Through the rolling introduction of the NYSE Hybrid Market the event dates in our analysis are scattered over almost four months.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A rollout staggered in time and space."
      ],
      "links": [
        [
          "rollout",
          "rollout"
        ]
      ]
    }
  ],
  "word": "rolling introduction"
}