"kniaz" meaning in English

{
  "forms": [
    {
      "form": "kniazes",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "kniazi",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "kniazi"
      },
      "expansion": "kniaz (plural kniazes or kniazi)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "duke or prince in medieval Slavic countries",
          "word": "knez"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of knez (“duke or prince in medieval Slavic countries”)"
      ],
      "id": "en-kniaz-en-noun-cy1gxyk6",
      "links": [
        [
          "knez",
          "knez#English"
        ]
      ],
      "raw_glosses": [
        "(historical) Alternative form of knez (“duke or prince in medieval Slavic countries”)"
      ],
      "tags": [
        "alt-of",
        "alternative",
        "historical"
      ]
    }
  ],
  "word": "kniaz"
}

{
  "forms": [
    {
      "form": "kniazes",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "kniazi",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "es",
        "2": "kniazi"
      },
      "expansion": "kniaz (plural kniazes or kniazi)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "duke or prince in medieval Slavic countries",
          "word": "knez"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms with historical senses",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Alternative form of knez (“duke or prince in medieval Slavic countries”)"
      ],
      "links": [
        [
          "knez",
          "knez#English"
        ]
      ],
      "raw_glosses": [
        "(historical) Alternative form of knez (“duke or prince in medieval Slavic countries”)"
      ],
      "tags": [
        "alt-of",
        "alternative",
        "historical"
      ]
    }
  ],
  "word": "kniaz"
}