"lors de" meaning in French

{
  "head_templates": [
    {
      "args": {},
      "expansion": "lors de",
      "name": "fr-prep"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French prepositions",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "during, at the time of"
      ],
      "id": "en-lors_de-fr-prep-cbkUn8l~",
      "links": [
        [
          "during",
          "during"
        ],
        [
          "time",
          "time"
        ]
      ],
      "synonyms": [
        {
          "english": "before a vowel sound, but not before aspirated h",
          "word": "lors d’"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/lɔʁ də/"
    }
  ],
  "word": "lors de"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "lors de",
      "name": "fr-prep"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French prepositions",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "during, at the time of"
      ],
      "links": [
        [
          "during",
          "during"
        ],
        [
          "time",
          "time"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/lɔʁ də/"
    }
  ],
  "synonyms": [
    {
      "english": "before a vowel sound, but not before aspirated h",
      "word": "lors d’"
    }
  ],
  "word": "lors de"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: before a consonant sound and aspirated h",
  "path": [
    "lors de"
  ],
  "section": "French",
  "subsection": "preposition",
  "title": "lors de",
  "trace": ""
}