"alpha city" meaning in English

{
  "forms": [
    {
      "form": "alpha cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "alpha city (plural alpha cities)",
      "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": "2016, Alec Ross, The Industries of the Future",
          "text": "Exporting advanced services across the globe, they represent mini-economies in themselves. I am much more likely to run into an American who is a leading global innovator in an alpha city like Shanghai or Dubai than I am to see her or him in St. Louis, Missouri, or Manchester, England.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A city that links a major economic state or region into the world economy."
      ],
      "id": "en-alpha_city-en-noun-YK~KYAm5",
      "links": [
        [
          "major",
          "major"
        ],
        [
          "economic",
          "economic"
        ],
        [
          "state",
          "state"
        ],
        [
          "region",
          "region"
        ],
        [
          "world",
          "world"
        ],
        [
          "economy",
          "economy"
        ]
      ]
    }
  ],
  "word": "alpha city"
}

{
  "forms": [
    {
      "form": "alpha cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "alpha city (plural alpha cities)",
      "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": "2016, Alec Ross, The Industries of the Future",
          "text": "Exporting advanced services across the globe, they represent mini-economies in themselves. I am much more likely to run into an American who is a leading global innovator in an alpha city like Shanghai or Dubai than I am to see her or him in St. Louis, Missouri, or Manchester, England.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A city that links a major economic state or region into the world economy."
      ],
      "links": [
        [
          "major",
          "major"
        ],
        [
          "economic",
          "economic"
        ],
        [
          "state",
          "state"
        ],
        [
          "region",
          "region"
        ],
        [
          "world",
          "world"
        ],
        [
          "economy",
          "economy"
        ]
      ]
    }
  ],
  "word": "alpha city"
}