"na věky" meaning in Czech

{
  "etymology_templates": [
    {
      "args": {
        "1": "cs",
        "2": "na",
        "3": "věk"
      },
      "expansion": "na + věk",
      "name": "compound"
    },
    {
      "args": {
        "1": "sh",
        "2": "zauvijek"
      },
      "expansion": "Serbo-Croatian zauvijek",
      "name": "cog"
    },
    {
      "args": {
        "1": "ru",
        "2": "навек"
      },
      "expansion": "Russian навек (navek)",
      "name": "cog"
    }
  ],
  "etymology_text": "From na + věk. Similar compositions are Serbo-Croatian zauvijek and Russian навек (navek).",
  "forms": [
    {
      "form": "navěky",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "na věky",
      "name": "cs-adv"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Czech 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"
        }
      ],
      "glosses": [
        "forever"
      ],
      "id": "en-na_věky-cs-adv-IHD3Jf8c",
      "links": [
        [
          "forever",
          "forever"
        ]
      ],
      "synonyms": [
        {
          "word": "navždy"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[na vjɛkɪ]"
    }
  ],
  "word": "na věky"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cs",
        "2": "na",
        "3": "věk"
      },
      "expansion": "na + věk",
      "name": "compound"
    },
    {
      "args": {
        "1": "sh",
        "2": "zauvijek"
      },
      "expansion": "Serbo-Croatian zauvijek",
      "name": "cog"
    },
    {
      "args": {
        "1": "ru",
        "2": "навек"
      },
      "expansion": "Russian навек (navek)",
      "name": "cog"
    }
  ],
  "etymology_text": "From na + věk. Similar compositions are Serbo-Croatian zauvijek and Russian навек (navek).",
  "forms": [
    {
      "form": "navěky",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "na věky",
      "name": "cs-adv"
    }
  ],
  "lang": "Czech",
  "lang_code": "cs",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Czech adverbs",
        "Czech compound terms",
        "Czech entries with incorrect language header",
        "Czech lemmas",
        "Czech multiword terms",
        "Czech terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "forever"
      ],
      "links": [
        [
          "forever",
          "forever"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[na vjɛkɪ]"
    }
  ],
  "synonyms": [
    {
      "word": "navždy"
    }
  ],
  "word": "na věky"
}