"ka" meaning in Croate

{
  "categories": [
    {
      "kind": "other",
      "name": "Pronoms indéfinis en croate",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Croate",
      "orig": "croate",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du proto-slave kaъ",
    "Du proto-slave kъjь"
  ],
  "forms": [
    {
      "form": "kaj"
    },
    {
      "form": "koja"
    }
  ],
  "lang": "Croate",
  "lang_code": "hr",
  "pos": "pron",
  "pos_title": "Pronom indéfini",
  "senses": [
    {
      "glosses": [
        "Que, quoi."
      ],
      "id": "fr-ka-hr-pron-Kj9HMzLL"
    },
    {
      "glosses": [
        "Qui."
      ],
      "id": "fr-ka-hr-pron-NLozwi5f"
    }
  ],
  "synonyms": [
    {
      "word": "što"
    },
    {
      "word": "ča"
    },
    {
      "word": "ktera"
    }
  ],
  "tags": [
    "indefinite"
  ],
  "word": "ka"
}

{
  "categories": [
    "Pronoms indéfinis en croate",
    "croate"
  ],
  "etymology_texts": [
    "Du proto-slave kaъ",
    "Du proto-slave kъjь"
  ],
  "forms": [
    {
      "form": "kaj"
    },
    {
      "form": "koja"
    }
  ],
  "lang": "Croate",
  "lang_code": "hr",
  "pos": "pron",
  "pos_title": "Pronom indéfini",
  "senses": [
    {
      "glosses": [
        "Que, quoi."
      ]
    },
    {
      "glosses": [
        "Qui."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "što"
    },
    {
      "word": "ča"
    },
    {
      "word": "ktera"
    }
  ],
  "tags": [
    "indefinite"
  ],
  "word": "ka"
}