"ETA" meaning in Basque

{
  "head_templates": [
    {
      "args": {
        "1": "in"
      },
      "expansion": "ETA inan",
      "name": "eu-proper noun"
    }
  ],
  "lang": "Basque",
  "lang_code": "eu",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Euskadi Ta Askatasuna"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Basque entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 5 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "eu",
          "name": "Basque nationalism",
          "orig": "eu:Basque nationalism",
          "parents": [
            "Basque Country, Spain",
            "Nationalism",
            "Autonomous communities of Spain",
            "Ideologies",
            "Autonomous communities",
            "Places",
            "Politics",
            "Society",
            "Political divisions",
            "Names",
            "All topics",
            "Polities",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Acronym of Euskadi Ta Askatasuna."
      ],
      "id": "en-ETA-eu-name-dpXUJXLH",
      "links": [
        [
          "Euskadi Ta Askatasuna",
          "Euskadi Ta Askatasuna#Basque"
        ]
      ],
      "tags": [
        "abbreviation",
        "acronym",
        "alt-of",
        "inanimate"
      ],
      "wikipedia": [
        "eu:ETA"
      ]
    }
  ],
  "word": "ETA"
}

{
  "head_templates": [
    {
      "args": {
        "1": "in"
      },
      "expansion": "ETA inan",
      "name": "eu-proper noun"
    }
  ],
  "lang": "Basque",
  "lang_code": "eu",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "word": "Euskadi Ta Askatasuna"
        }
      ],
      "categories": [
        "Basque acronyms",
        "Basque entries with incorrect language header",
        "Basque inanimate nouns",
        "Basque lemmas",
        "Basque proper nouns",
        "Pages with 5 entries",
        "Pages with entries",
        "eu:Basque nationalism"
      ],
      "glosses": [
        "Acronym of Euskadi Ta Askatasuna."
      ],
      "links": [
        [
          "Euskadi Ta Askatasuna",
          "Euskadi Ta Askatasuna#Basque"
        ]
      ],
      "tags": [
        "abbreviation",
        "acronym",
        "alt-of",
        "inanimate"
      ],
      "wikipedia": [
        "eu:ETA"
      ]
    }
  ],
  "word": "ETA"
}