"mega-" meaning in Portuguese

{
  "etymology_templates": [
    {
      "args": {
        "1": "pt",
        "2": "grc",
        "3": "μέγας",
        "4": "",
        "5": "great, large, mighty"
      },
      "expansion": "Borrowed from Ancient Greek μέγας (mégas, “great, large, mighty”)",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from Ancient Greek μέγας (mégas, “great, large, mighty”).",
  "head_templates": [
    {
      "args": {
        "1": "pt",
        "2": "prefix"
      },
      "expansion": "mega-",
      "name": "head"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "mega- (very large, great)"
      ],
      "id": "en-mega--pt-prefix-ER2leiC3",
      "links": [
        [
          "mega-",
          "mega-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "4 96",
          "kind": "other",
          "name": "Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "mega- (multiplication factor of one million)"
      ],
      "id": "en-mega--pt-prefix-cmqE-VY3",
      "links": [
        [
          "mega-",
          "mega-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "mega-"
}

{
  "categories": [
    "Pages using catfix",
    "Pages with 23 entries",
    "Pages with entries",
    "Portuguese entries with incorrect language header",
    "Portuguese lemmas",
    "Portuguese prefixes",
    "Portuguese terms borrowed from Ancient Greek",
    "Portuguese terms derived from Ancient Greek"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "pt",
        "2": "grc",
        "3": "μέγας",
        "4": "",
        "5": "great, large, mighty"
      },
      "expansion": "Borrowed from Ancient Greek μέγας (mégas, “great, large, mighty”)",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from Ancient Greek μέγας (mégas, “great, large, mighty”).",
  "head_templates": [
    {
      "args": {
        "1": "pt",
        "2": "prefix"
      },
      "expansion": "mega-",
      "name": "head"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "mega- (very large, great)"
      ],
      "links": [
        [
          "mega-",
          "mega-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "mega- (multiplication factor of one million)"
      ],
      "links": [
        [
          "mega-",
          "mega-#English"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "mega-"
}