"нууц" meaning in Mongolian

{
  "forms": [
    {
      "form": "nuuc",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "ᠨᠢᠭᠤᠴᠠ",
      "roman": "niɣuča",
      "tags": [
        "Mongolian"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ᠨᠢᠭᠤᠴᠠ"
      },
      "expansion": "нууц • (nuuc) (Mongolian spelling ᠨᠢᠭᠤᠴᠠ (niɣuča))",
      "name": "mn-noun"
    }
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Mongolian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mongolian terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "secret"
      ],
      "id": "en-нууц-mn-noun-K7gNU3sd",
      "links": [
        [
          "secret",
          "secret"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/nʊːt͡s/"
    }
  ],
  "word": "нууц"
}

{
  "forms": [
    {
      "form": "nuuc",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "ᠨᠢᠭᠤᠴᠠ",
      "roman": "niɣuča",
      "tags": [
        "Mongolian"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ᠨᠢᠭᠤᠴᠠ"
      },
      "expansion": "нууц • (nuuc) (Mongolian spelling ᠨᠢᠭᠤᠴᠠ (niɣuča))",
      "name": "mn-noun"
    }
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Mongolian 1-syllable words",
        "Mongolian entries with incorrect language header",
        "Mongolian lemmas",
        "Mongolian nouns",
        "Mongolian terms with redundant script codes",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "secret"
      ],
      "links": [
        [
          "secret",
          "secret"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/nʊːt͡s/"
    }
  ],
  "word": "нууц"
}