"втечняването" meaning in Bulgarian

{
  "forms": [
    {
      "form": "втечня́ването",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "vtečnjávaneto",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Bulgarian 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"
        }
      ],
      "form_of": [
        {
          "extra": "vtečnjávane",
          "word": "втечня́ване"
        }
      ],
      "glosses": [
        "definite singular of втечня́ване (vtečnjávane)"
      ],
      "id": "en-втечняването-bg-noun-AN9vj98f",
      "links": [
        [
          "втечня́ване",
          "втечняване#Bulgarian"
        ]
      ],
      "tags": [
        "definite",
        "form-of",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ftɛt͡ʃˈnʲa̟vɐnɛto]"
    }
  ],
  "word": "втечняването"
}

{
  "forms": [
    {
      "form": "втечня́ването",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "vtečnjávaneto",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "Bulgarian",
  "lang_code": "bg",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Bulgarian entries with incorrect language header",
        "Bulgarian non-lemma forms",
        "Bulgarian noun forms",
        "Bulgarian terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "vtečnjávane",
          "word": "втечня́ване"
        }
      ],
      "glosses": [
        "definite singular of втечня́ване (vtečnjávane)"
      ],
      "links": [
        [
          "втечня́ване",
          "втечняване#Bulgarian"
        ]
      ],
      "tags": [
        "definite",
        "form-of",
        "singular"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ftɛt͡ʃˈnʲa̟vɐnɛto]"
    }
  ],
  "word": "втечняването"
}