"ერთადერთი" meaning in Georgian

{
  "forms": [
    {
      "form": "ertaderti",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "ერთადერთი • (ertaderti) (not comparable)",
      "name": "ka-adj"
    }
  ],
  "lang": "Georgian",
  "lang_code": "ka",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Georgian 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"
        }
      ],
      "glosses": [
        "only, sole"
      ],
      "id": "en-ერთადერთი-ka-adj-IH69YEH4",
      "links": [
        [
          "only",
          "only"
        ],
        [
          "sole",
          "sole"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[eɾtʰadeɾtʰi]"
    }
  ],
  "word": "ერთადერთი"
}

{
  "forms": [
    {
      "form": "ertaderti",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "ერთადერთი • (ertaderti) (not comparable)",
      "name": "ka-adj"
    }
  ],
  "lang": "Georgian",
  "lang_code": "ka",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "Georgian adjectives",
        "Georgian entries with incorrect language header",
        "Georgian lemmas",
        "Georgian terms with IPA pronunciation",
        "Georgian uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "only, sole"
      ],
      "links": [
        [
          "only",
          "only"
        ],
        [
          "sole",
          "sole"
        ]
      ],
      "tags": [
        "not-comparable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[eɾtʰadeɾtʰi]"
    }
  ],
  "word": "ერთადერთი"
}