"bientost" 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"
    }
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "bientôt"
    }
  ],
  "etymology_texts": [
    "Composé de bien et de tost."
  ],
  "forms": [
    {
      "form": "bien tost"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adv",
  "pos_title": "Adverbe",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en ancien français",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Exemples en ancien français à traduire",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              0,
              9
            ]
          ],
          "ref": "Marie de France, Bisclaveret, manuscrit de la British Library",
          "text": "Bien tost en puis aver la mort"
        }
      ],
      "glosses": [
        "Bientôt."
      ],
      "id": "fr-bientost-fro-adv-6w0IVS0l"
    }
  ],
  "word": "bientost"
}

{
  "categories": [
    "Adverbes en ancien français",
    "ancien français"
  ],
  "derived": [
    {
      "lang": "Français",
      "lang_code": "fr",
      "word": "bientôt"
    }
  ],
  "etymology_texts": [
    "Composé de bien et de tost."
  ],
  "forms": [
    {
      "form": "bien tost"
    }
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "adv",
  "pos_title": "Adverbe",
  "senses": [
    {
      "categories": [
        "Exemples en ancien français",
        "Exemples en ancien français à traduire"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              0,
              9
            ]
          ],
          "ref": "Marie de France, Bisclaveret, manuscrit de la British Library",
          "text": "Bien tost en puis aver la mort"
        }
      ],
      "glosses": [
        "Bientôt."
      ]
    }
  ],
  "word": "bientost"
}