"dlaczego" meaning in Old Polish

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "zlw-mas",
            "2": "dlácégój",
            "alts": "1"
          },
          "expansion": "Masurian: dlácégój, lácégo, lácégój",
          "name": "desc"
        }
      ],
      "text": "Masurian: dlácégój, lácégo, lácégój"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pl",
            "2": "dlaczego"
          },
          "expansion": "Polish: dlaczego",
          "name": "desc"
        }
      ],
      "text": "Polish: dlaczego"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "szl",
            "2": "dlŏczego"
          },
          "expansion": "Silesian: dlŏczego",
          "name": "desc"
        }
      ],
      "text": "Silesian: dlŏczego"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "dla",
        "3": "co<alt:czego>",
        "lit": "for what"
      },
      "expansion": "Univerbation of dla + czego, literally “for what”",
      "name": "univ"
    },
    {
      "args": {
        "1": "end of the fifteenth century"
      },
      "expansion": "the end of the fifteenth century",
      "name": "etydate/the"
    },
    {
      "args": {
        "1": "end of the fifteenth century"
      },
      "expansion": "First attested in the end of the fifteenth century",
      "name": "etydate"
    }
  ],
  "etymology_text": "Univerbation of dla + czego, literally “for what”. First attested in the end of the fifteenth century.",
  "head_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "conjunction"
      },
      "expansion": "dlaczego",
      "name": "head"
    }
  ],
  "lang": "Old Polish",
  "lang_code": "zlw-opl",
  "pos": "conj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Masovia Old Polish",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Old Polish univerbations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "that's why, so, ergo"
      ],
      "id": "en-dlaczego-zlw-opl-conj-pZjlmT3-",
      "links": [
        [
          "that's why",
          "that's why"
        ],
        [
          "so",
          "so"
        ],
        [
          "ergo",
          "ergo"
        ]
      ],
      "qualifier": "attested in Masovia",
      "raw_glosses": [
        "(attested in Masovia) that's why, so, ergo"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/dlʲaːt͡ʃʲɛɡɔ/",
      "note": "10ᵗʰ–15ᵗʰ CE"
    },
    {
      "ipa": "/dlʲɒt͡ʃʲɛɡɔ/",
      "note": "15ᵗʰ CE"
    }
  ],
  "word": "dlaczego"
}

{
  "descendants": [
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "zlw-mas",
            "2": "dlácégój",
            "alts": "1"
          },
          "expansion": "Masurian: dlácégój, lácégo, lácégój",
          "name": "desc"
        }
      ],
      "text": "Masurian: dlácégój, lácégo, lácégój"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "pl",
            "2": "dlaczego"
          },
          "expansion": "Polish: dlaczego",
          "name": "desc"
        }
      ],
      "text": "Polish: dlaczego"
    },
    {
      "depth": 1,
      "templates": [
        {
          "args": {
            "1": "szl",
            "2": "dlŏczego"
          },
          "expansion": "Silesian: dlŏczego",
          "name": "desc"
        }
      ],
      "text": "Silesian: dlŏczego"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "dla",
        "3": "co<alt:czego>",
        "lit": "for what"
      },
      "expansion": "Univerbation of dla + czego, literally “for what”",
      "name": "univ"
    },
    {
      "args": {
        "1": "end of the fifteenth century"
      },
      "expansion": "the end of the fifteenth century",
      "name": "etydate/the"
    },
    {
      "args": {
        "1": "end of the fifteenth century"
      },
      "expansion": "First attested in the end of the fifteenth century",
      "name": "etydate"
    }
  ],
  "etymology_text": "Univerbation of dla + czego, literally “for what”. First attested in the end of the fifteenth century.",
  "head_templates": [
    {
      "args": {
        "1": "zlw-opl",
        "2": "conjunction"
      },
      "expansion": "dlaczego",
      "name": "head"
    }
  ],
  "lang": "Old Polish",
  "lang_code": "zlw-opl",
  "pos": "conj",
  "senses": [
    {
      "categories": [
        "Masovia Old Polish",
        "Old Polish conjunctions",
        "Old Polish entries with incorrect language header",
        "Old Polish lemmas",
        "Old Polish terms with IPA pronunciation",
        "Old Polish univerbations",
        "Pages with 2 entries"
      ],
      "glosses": [
        "that's why, so, ergo"
      ],
      "links": [
        [
          "that's why",
          "that's why"
        ],
        [
          "so",
          "so"
        ],
        [
          "ergo",
          "ergo"
        ]
      ],
      "qualifier": "attested in Masovia",
      "raw_glosses": [
        "(attested in Masovia) that's why, so, ergo"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/dlʲaːt͡ʃʲɛɡɔ/",
      "note": "10ᵗʰ–15ᵗʰ CE"
    },
    {
      "ipa": "/dlʲɒt͡ʃʲɛɡɔ/",
      "note": "15ᵗʰ CE"
    }
  ],
  "word": "dlaczego"
}