"deca-" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "grc",
        "3": "δεκάς"
      },
      "expansion": "Ancient Greek δεκάς (dekás)",
      "name": "der"
    }
  ],
  "etymology_text": "Ultimately from Ancient Greek δεκάς (dekás), from δέκα (déka, “ten”).",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "prefix"
      },
      "expansion": "deca-",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 5 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "it",
          "name": "Ten",
          "orig": "it:Ten",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "deca-"
      ],
      "id": "en-deca--it-prefix-wfX~0zrw",
      "links": [
        [
          "deca-",
          "deca-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "deca-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "grc",
        "3": "δεκάς"
      },
      "expansion": "Ancient Greek δεκάς (dekás)",
      "name": "der"
    }
  ],
  "etymology_text": "Ultimately from Ancient Greek δεκάς (dekás), from δέκα (déka, “ten”).",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "prefix"
      },
      "expansion": "deca-",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian prefixes",
        "Italian terms derived from Ancient Greek",
        "Pages with 5 entries",
        "Pages with entries",
        "it:Metric prefixes",
        "it:Ten"
      ],
      "glosses": [
        "deca-"
      ],
      "links": [
        [
          "deca-",
          "deca-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "deca-"
}