"au propos" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbes en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "sense": "Chirurgie, H. de Mondeville",
      "word": "ou propos"
    }
  ],
  "senses": [
    {
      "glosses": [
        "À propos de, en ce qui concerne."
      ],
      "id": "fr-au_propos-fro-adv-pX6sPfxG",
      "raw_tags": [
        "Avec de"
      ]
    }
  ],
  "word": "au propos"
}

{
  "categories": [
    "Adverbes en ancien français",
    "ancien français"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adv",
  "pos_title": "Adverbe",
  "related": [
    {
      "sense": "Chirurgie, H. de Mondeville",
      "word": "ou propos"
    }
  ],
  "senses": [
    {
      "glosses": [
        "À propos de, en ce qui concerne."
      ],
      "raw_tags": [
        "Avec de"
      ]
    }
  ],
  "word": "au propos"
}