"-estь" meaning in Proto-Slavic

{
  "descendants": [
    {
      "descendants": [
        {
          "lang": "Old Church Slavonic",
          "lang_code": "cu",
          "roman": "-estĭ",
          "word": "-есть"
        }
      ],
      "lang": "South Slavic",
      "lang_code": "unknown"
    }
  ],
  "forms": [
    {
      "form": "no-table-tags",
      "source": "declension",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "sla-decl-noun",
      "source": "declension",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "-estь",
      "source": "declension",
      "tags": [
        "nominative",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "genitive",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "dative",
        "singular"
      ]
    },
    {
      "form": "-estь",
      "source": "declension",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "-estьjǫ",
      "roman": "-esťǫ",
      "source": "declension",
      "tags": [
        "instrumental",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "locative",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "singular",
        "vocative"
      ]
    }
  ],
  "inflection_templates": [
    {
      "args": {
        "g": "f",
        "n": "s"
      },
      "name": "sla-decl-noun"
    }
  ],
  "lang": "Proto-Slavic",
  "lang_code": "sla-pro",
  "original_title": "Reconstruction:Proto-Slavic/-estь",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages using catfix",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Proto-Slavic entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Proto-Slavic singularia tantum",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "bujь → *bujestь"
        },
        {
          "text": "gořьjь → *gořestь"
        }
      ],
      "form_of": [
        {
          "extra": "ending in a palatal consonant",
          "word": "*-ostь"
        },
        {
          "extra": "ending in a palatal consonant",
          "word": "used with soft stems"
        }
      ],
      "glosses": [
        "Variant form of *-ostь, used with soft stems (ending in a palatal consonant)."
      ],
      "id": "en--estь-sla-pro-suffix-wfHY-1zp",
      "links": [
        [
          "*-ostь",
          "Reconstruction:Proto-Slavic/-ostь"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "morpheme",
        "reconstruction",
        "variant"
      ]
    }
  ],
  "word": "-estь"
}

{
  "descendants": [
    {
      "descendants": [
        {
          "lang": "Old Church Slavonic",
          "lang_code": "cu",
          "roman": "-estĭ",
          "word": "-есть"
        }
      ],
      "lang": "South Slavic",
      "lang_code": "unknown"
    }
  ],
  "forms": [
    {
      "form": "no-table-tags",
      "source": "declension",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "sla-decl-noun",
      "source": "declension",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "-estь",
      "source": "declension",
      "tags": [
        "nominative",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "genitive",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "dative",
        "singular"
      ]
    },
    {
      "form": "-estь",
      "source": "declension",
      "tags": [
        "accusative",
        "singular"
      ]
    },
    {
      "form": "-estьjǫ",
      "roman": "-esťǫ",
      "source": "declension",
      "tags": [
        "instrumental",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "locative",
        "singular"
      ]
    },
    {
      "form": "-esti",
      "source": "declension",
      "tags": [
        "singular",
        "vocative"
      ]
    }
  ],
  "inflection_templates": [
    {
      "args": {
        "g": "f",
        "n": "s"
      },
      "name": "sla-decl-noun"
    }
  ],
  "lang": "Proto-Slavic",
  "lang_code": "sla-pro",
  "original_title": "Reconstruction:Proto-Slavic/-estь",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Pages using catfix",
        "Pages with 1 entry",
        "Pages with entries",
        "Proto-Slavic entries with incorrect language header",
        "Proto-Slavic feminine i-stem nouns",
        "Proto-Slavic feminine suffixes",
        "Proto-Slavic i-stem nouns",
        "Proto-Slavic lemmas",
        "Proto-Slavic noun-forming suffixes",
        "Proto-Slavic singularia tantum",
        "Proto-Slavic suffixes"
      ],
      "examples": [
        {
          "text": "bujь → *bujestь"
        },
        {
          "text": "gořьjь → *gořestь"
        }
      ],
      "form_of": [
        {
          "extra": "ending in a palatal consonant",
          "word": "*-ostь"
        },
        {
          "extra": "ending in a palatal consonant",
          "word": "used with soft stems"
        }
      ],
      "glosses": [
        "Variant form of *-ostь, used with soft stems (ending in a palatal consonant)."
      ],
      "links": [
        [
          "*-ostь",
          "Reconstruction:Proto-Slavic/-ostь"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "morpheme",
        "reconstruction",
        "variant"
      ]
    }
  ],
  "word": "-estь"
}