"Kyivan Rus'" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "word": "Kievan Rus"
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      "glosses": [
        "Alternative form of Kievan Rus"
      ],
      "id": "en-Kyivan_Rus'-en-name-JdX88FOH",
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  ],
  "word": "Kyivan Rus'"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "Kyivan Rus'",
      "name": "en-proper noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Kievan Rus"
        }
      ],
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        "English entries with incorrect language header",
        "English lemmas",
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        "English proper nouns",
        "English uncountable nouns"
      ],
      "glosses": [
        "Alternative form of Kievan Rus"
      ],
      "links": [
        [
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      "tags": [
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  "word": "Kyivan Rus'"
}