"primate city" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "primate",
        "3": "city"
      },
      "expansion": "primate + city",
      "name": "compound"
    }
  ],
  "etymology_text": "From primate + city, coined in 1939 by Mark Jefferson.",
  "forms": [
    {
      "form": "primate cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "primate city (plural primate cities)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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          "langcode": "en",
          "name": "Cities",
          "orig": "en:Cities",
          "parents": [],
          "source": "w"
        },
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          "langcode": "en",
          "name": "Geography",
          "orig": "en:Geography",
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          "kind": "other",
          "langcode": "en",
          "name": "Sociology",
          "orig": "en:Sociology",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A city in a geographic region that is much more populous than any other cities in that region."
      ],
      "id": "en-primate_city-en-noun-6Fcr2wO3",
      "links": [
        [
          "city",
          "city"
        ],
        [
          "populous",
          "populous"
        ]
      ],
      "wikipedia": [
        "Mark Jefferson (geographer)"
      ]
    }
  ],
  "word": "primate city"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "primate",
        "3": "city"
      },
      "expansion": "primate + city",
      "name": "compound"
    }
  ],
  "etymology_text": "From primate + city, coined in 1939 by Mark Jefferson.",
  "forms": [
    {
      "form": "primate cities",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "primate city (plural primate cities)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English compound terms",
        "English countable nouns",
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        "en:Cities",
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        "en:Sociology"
      ],
      "glosses": [
        "A city in a geographic region that is much more populous than any other cities in that region."
      ],
      "links": [
        [
          "city",
          "city"
        ],
        [
          "populous",
          "populous"
        ]
      ],
      "wikipedia": [
        "Mark Jefferson (geographer)"
      ]
    }
  ],
  "word": "primate city"
}