"nen" meaning in Welsh

{
  "forms": [
    {
      "form": "nennau",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "nennoedd",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "nennau",
        "pl2": "nennoedd"
      },
      "expansion": "nen f (plural nennau or nennoedd, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 21 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with language headings in the wrong order",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "heaven"
      ],
      "id": "en-nen-cy-noun-gY7-RqbC",
      "links": [
        [
          "heaven",
          "heaven"
        ]
      ],
      "synonyms": [
        {
          "word": "nef"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɛn"
    }
  ],
  "word": "nen"
}

{
  "forms": [
    {
      "form": "nennau",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "nennoedd",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "nennau",
        "pl2": "nennoedd"
      },
      "expansion": "nen f (plural nennau or nennoedd, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 21 entries",
        "Pages with entries",
        "Pages with language headings in the wrong order",
        "Rhymes:Welsh/ɛn",
        "Rhymes:Welsh/ɛn/1 syllable",
        "Welsh countable nouns",
        "Welsh entries with incorrect language header",
        "Welsh feminine nouns",
        "Welsh lemmas",
        "Welsh non-mutable terms",
        "Welsh nouns",
        "Welsh nouns with red links in their headword lines",
        "Welsh palindromes"
      ],
      "glosses": [
        "heaven"
      ],
      "links": [
        [
          "heaven",
          "heaven"
        ]
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɛn"
    }
  ],
  "synonyms": [
    {
      "word": "nef"
    }
  ],
  "word": "nen"
}