"d'aventure" meaning in French

{
  "forms": [
    {
      "form": "d’ aventure",
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        "canonical"
      ]
    }
  ],
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    {
      "args": {
        "head": "d'aventure"
      },
      "expansion": "d’aventure",
      "name": "fr-adv"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adv",
  "senses": [
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        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
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      "examples": [
        {
          "ref": "1916, Charles Le Goffic, Bourguignottes et pompons rouges, page 117:",
          "text": "«Il pleuvait presque sans discontinuer depuis la Toussaint et quand, d’aventure, l’horizon se décrassait, les vents du large opprimaient tout l’espace […]. »",
          "type": "quote"
        }
      ],
      "glosses": [
        "by chance"
      ],
      "id": "en-d'aventure-fr-adv-4b2Cq~~h",
      "links": [
        [
          "by chance",
          "by chance"
        ]
      ],
      "raw_glosses": [
        "(literary) by chance"
      ],
      "synonyms": [
        {
          "word": "par hasard"
        }
      ],
      "tags": [
        "literary"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/d‿a.vɑ̃.tyʁ/"
    }
  ],
  "word": "d'aventure"
}

{
  "forms": [
    {
      "form": "d’ aventure",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "d'aventure"
      },
      "expansion": "d’aventure",
      "name": "fr-adv"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adv",
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        {
          "ref": "1916, Charles Le Goffic, Bourguignottes et pompons rouges, page 117:",
          "text": "«Il pleuvait presque sans discontinuer depuis la Toussaint et quand, d’aventure, l’horizon se décrassait, les vents du large opprimaient tout l’espace […]. »",
          "type": "quote"
        }
      ],
      "glosses": [
        "by chance"
      ],
      "links": [
        [
          "by chance",
          "by chance"
        ]
      ],
      "raw_glosses": [
        "(literary) by chance"
      ],
      "synonyms": [
        {
          "word": "par hasard"
        }
      ],
      "tags": [
        "literary"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/d‿a.vɑ̃.tyʁ/"
    }
  ],
  "word": "d'aventure"
}