"demographic transition" meaning in English

{
  "forms": [
    {
      "form": "demographic transitions",
      "tags": [
        "plural"
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  "head_templates": [
    {
      "args": {
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      "expansion": "demographic transition (countable and uncountable, plural demographic transitions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Demography",
          "orig": "en:Demography",
          "parents": [
            "Sciences",
            "Statistics",
            "All topics",
            "Formal sciences",
            "Mathematics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "The process that represents the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system."
      ],
      "id": "en-demographic_transition-en-noun-74qm~4Dm",
      "links": [
        [
          "demography",
          "demography"
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      ],
      "raw_glosses": [
        "(demography) The process that represents the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "demographics",
        "demography"
      ]
    }
  ],
  "word": "demographic transition"
}

{
  "forms": [
    {
      "form": "demographic transitions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "demographic transition (countable and uncountable, plural demographic transitions)",
      "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 uncountable nouns",
        "en:Demography"
      ],
      "glosses": [
        "The process that represents the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system."
      ],
      "links": [
        [
          "demography",
          "demography"
        ]
      ],
      "raw_glosses": [
        "(demography) The process that represents the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "demographics",
        "demography"
      ]
    }
  ],
  "word": "demographic transition"
}