"quel qu'eût été" meaning in French

{
  "forms": [
    {
      "form": "quel qu’ eût été",
      "tags": [
        "canonical",
        "masculine"
      ]
    },
    {
      "form": "quelle qu’eût été",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "quels qu’eussent été",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "quelles qu’eussent été",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "f": "quelle qu'eût été",
        "fp": "quelles qu'eussent été",
        "mp": "quels qu'eussent été"
      },
      "expansion": "quel qu’eût été m (feminine quelle qu’eût été, masculine plural quels qu’eussent été, feminine plural quelles qu’eussent été)",
      "name": "fr-det"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "det",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French determiners",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French 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"
        }
      ],
      "coordinate_terms": [
        {
          "english": "present simple subjunctive",
          "word": "quel que soit"
        },
        {
          "tags": [
            "perfect",
            "present",
            "subjunctive"
          ],
          "word": "quel qu’ait été"
        },
        {
          "english": "past simple subjunctive",
          "word": "quel que fût"
        }
      ],
      "examples": [
        {
          "ref": "1862, Œuvres complètes de J.-J. Rousseau, page 50:",
          "text": "Quel qu’eût été le motif de son changement de religion, elle fut sincère dans celle qu’elle avait embrassée.",
          "type": "quote"
        }
      ],
      "glosses": [
        "whatever, regardless of what, no matter what ... had been"
      ],
      "id": "en-quel_qu'eût_été-fr-det-zyWq1PXP",
      "links": [
        [
          "whatever",
          "whatever"
        ],
        [
          "regardless of",
          "regardless of"
        ],
        [
          "no matter what",
          "no matter what"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kɛl k‿y.t‿e.te/"
    }
  ],
  "word": "quel qu'eût été"
}

{
  "coordinate_terms": [
    {
      "english": "present simple subjunctive",
      "word": "quel que soit"
    },
    {
      "tags": [
        "perfect",
        "present",
        "subjunctive"
      ],
      "word": "quel qu’ait été"
    },
    {
      "english": "past simple subjunctive",
      "word": "quel que fût"
    }
  ],
  "forms": [
    {
      "form": "quel qu’ eût été",
      "tags": [
        "canonical",
        "masculine"
      ]
    },
    {
      "form": "quelle qu’eût été",
      "tags": [
        "feminine"
      ]
    },
    {
      "form": "quels qu’eussent été",
      "tags": [
        "masculine",
        "plural"
      ]
    },
    {
      "form": "quelles qu’eussent été",
      "tags": [
        "feminine",
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "f": "quelle qu'eût été",
        "fp": "quelles qu'eussent été",
        "mp": "quels qu'eussent été"
      },
      "expansion": "quel qu’eût été m (feminine quelle qu’eût été, masculine plural quels qu’eussent été, feminine plural quelles qu’eussent été)",
      "name": "fr-det"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "det",
  "senses": [
    {
      "categories": [
        "French determiners",
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French terms with IPA pronunciation",
        "French terms with quotations",
        "Pages with 1 entry",
        "Pages with entries",
        "Requests for translations of French quotations"
      ],
      "examples": [
        {
          "ref": "1862, Œuvres complètes de J.-J. Rousseau, page 50:",
          "text": "Quel qu’eût été le motif de son changement de religion, elle fut sincère dans celle qu’elle avait embrassée.",
          "type": "quote"
        }
      ],
      "glosses": [
        "whatever, regardless of what, no matter what ... had been"
      ],
      "links": [
        [
          "whatever",
          "whatever"
        ],
        [
          "regardless of",
          "regardless of"
        ],
        [
          "no matter what",
          "no matter what"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/kɛl k‿y.t‿e.te/"
    }
  ],
  "word": "quel qu'eût été"
}