"IE." meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "IE.",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "IE"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English 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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Indo-European studies",
          "orig": "en:Indo-European studies",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of IE"
      ],
      "id": "en-IE.-en-noun-sTJJak5O",
      "links": [
        [
          "Indo-European studies",
          "Indo-European studies"
        ],
        [
          "IE",
          "IE#English"
        ]
      ],
      "raw_glosses": [
        "(Indo-European studies) Alternative form of IE"
      ],
      "tags": [
        "Indo-European-studies",
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "IE."
}

{
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "IE.",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "IE"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms spelled with .",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Indo-European studies"
      ],
      "glosses": [
        "Alternative form of IE"
      ],
      "links": [
        [
          "Indo-European studies",
          "Indo-European studies"
        ],
        [
          "IE",
          "IE#English"
        ]
      ],
      "raw_glosses": [
        "(Indo-European studies) Alternative form of IE"
      ],
      "tags": [
        "Indo-European-studies",
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "IE."
}