"plutost" meaning in Moyen français

{
  "categories": [
    {
      "kind": "other",
      "name": "Adverbes en moyen français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Moyen français",
      "orig": "moyen français",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Moyen français",
  "lang_code": "frm",
  "pos": "adv",
  "pos_title": "Adverbe",
  "senses": [
    {
      "glosses": [
        "Variante de plustost."
      ],
      "id": "fr-plutost-frm-adv-xJwmq7Rw"
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "plutost"
}

{
  "categories": [
    "Adverbes en moyen français",
    "moyen français"
  ],
  "lang": "Moyen français",
  "lang_code": "frm",
  "pos": "adv",
  "pos_title": "Adverbe",
  "senses": [
    {
      "glosses": [
        "Variante de plustost."
      ]
    }
  ],
  "tags": [
    "invariable"
  ],
  "word": "plutost"
}