"-нь" meaning in Ukrainian

{
  "etymology_templates": [
    {
      "args": {
        "1": "uk",
        "2": "-ння"
      },
      "expansion": "-ння (-nnja)",
      "name": "suffix"
    }
  ],
  "etymology_text": "From -ння (-nnja).",
  "forms": [
    {
      "form": "-nʹ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "suffix form",
        "g": "n-p",
        "head": "-нь"
      },
      "expansion": "-нь • (-nʹ) n pl",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ukrainian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "-nnja",
          "word": "-ння"
        }
      ],
      "glosses": [
        "genitive plural of -ння (-nnja)"
      ],
      "id": "en--нь-uk-suffix-VvjErKME",
      "links": [
        [
          "-ння",
          "-ння#Ukrainian"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "morpheme",
        "plural"
      ]
    }
  ],
  "word": "-нь"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "uk",
        "2": "-ння"
      },
      "expansion": "-ння (-nnja)",
      "name": "suffix"
    }
  ],
  "etymology_text": "From -ння (-nnja).",
  "forms": [
    {
      "form": "-nʹ",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "uk",
        "2": "suffix form",
        "g": "n-p",
        "head": "-нь"
      },
      "expansion": "-нь • (-nʹ) n pl",
      "name": "head"
    }
  ],
  "lang": "Ukrainian",
  "lang_code": "uk",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Ukrainian entries with incorrect language header",
        "Ukrainian non-lemma forms",
        "Ukrainian suffix forms",
        "Ukrainian terms with redundant head parameter"
      ],
      "form_of": [
        {
          "extra": "-nnja",
          "word": "-ння"
        }
      ],
      "glosses": [
        "genitive plural of -ння (-nnja)"
      ],
      "links": [
        [
          "-ння",
          "-ння#Ukrainian"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "morpheme",
        "plural"
      ]
    }
  ],
  "word": "-нь"
}