"sesdek" meaning in Esperanto

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "ses",
        "3": "dek"
      },
      "expansion": "ses + dek",
      "name": "compound"
    }
  ],
  "etymology_text": "From ses + dek.",
  "head_templates": [
    {
      "args": {
        "1": "eo",
        "2": "numeral"
      },
      "expansion": "sesdek",
      "name": "head"
    }
  ],
  "hyphenation": [
    "ses‧dek"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "name": "Esperanto cardinal numbers",
          "parents": [
            "Cardinal numbers",
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Esperanto entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "sixty"
      ],
      "id": "en-sesdek-eo-num-30EWThUS",
      "links": [
        [
          "sixty",
          "sixty"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈsesdek]"
    },
    {
      "rhymes": "-esdek"
    }
  ],
  "word": "sesdek"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "eo",
        "2": "ses",
        "3": "dek"
      },
      "expansion": "ses + dek",
      "name": "compound"
    }
  ],
  "etymology_text": "From ses + dek.",
  "head_templates": [
    {
      "args": {
        "1": "eo",
        "2": "numeral"
      },
      "expansion": "sesdek",
      "name": "head"
    }
  ],
  "hyphenation": [
    "ses‧dek"
  ],
  "lang": "Esperanto",
  "lang_code": "eo",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Esperanto cardinal numbers",
        "Esperanto compound terms",
        "Esperanto entries with incorrect language header",
        "Esperanto lemmas",
        "Esperanto numerals",
        "Esperanto terms with IPA pronunciation",
        "Esperanto terms with audio links",
        "Rhymes:Esperanto/esdek"
      ],
      "glosses": [
        "sixty"
      ],
      "links": [
        [
          "sixty",
          "sixty"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈsesdek]"
    },
    {
      "rhymes": "-esdek"
    }
  ],
  "word": "sesdek"
}