"またとない" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "日語平假名",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語短語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語複合詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語詞元",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "有1個詞條的頁面",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_text": "由また (mata) + と (to) + ない (nai)构成的复合词。",
  "forms": [
    {
      "form": "mata to nai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "日语",
  "lang_code": "ja",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "有使用例的日語詞",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "roman": "mata to nai kikai",
          "ruby": [
            [
              "機",
              "き"
            ],
            [
              "会",
              "かい"
            ]
          ],
          "text": "またとない機会",
          "translation": "仅此一次的机会"
        }
      ],
      "glosses": [
        "独一无二的，无比的"
      ],
      "id": "zh-またとない-ja-phrase-B5GS2eGw",
      "raw_tags": [
        "习语"
      ]
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "またとない"
}

{
  "categories": [
    "日語平假名",
    "日語短語",
    "日語複合詞",
    "日語詞元",
    "有1個詞條的頁面"
  ],
  "etymology_text": "由また (mata) + と (to) + ない (nai)构成的复合词。",
  "forms": [
    {
      "form": "mata to nai",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "日语",
  "lang_code": "ja",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "有使用例的日語詞"
      ],
      "examples": [
        {
          "roman": "mata to nai kikai",
          "ruby": [
            [
              "機",
              "き"
            ],
            [
              "会",
              "かい"
            ]
          ],
          "text": "またとない機会",
          "translation": "仅此一次的机会"
        }
      ],
      "glosses": [
        "独一无二的，无比的"
      ],
      "raw_tags": [
        "习语"
      ]
    }
  ],
  "tags": [
    "idiomatic"
  ],
  "word": "またとない"
}