"a son escient" meaning in Middle French

{
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "2": "adverb"
      },
      "expansion": "a son escient",
      "name": "head"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Middle French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "Good sirs, you know very well that our custom is that we have to choose who, to the best of our knowledge, has performed the best in the tournament.",
          "ref": "1488, Jean Dupré, Lancelot du Lac, page 59:",
          "text": "Beaux seigneurs vous scavez bien que la coustume de ceans est telle que nous devons eslire cellui a nostre escient qui le mieulx a fait au tournoiement.",
          "type": "quote"
        }
      ],
      "glosses": [
        "to one's knowledge; to the best of one's knowledge"
      ],
      "id": "en-a_son_escient-frm-adv-ScagFF5j",
      "links": [
        [
          "to one's knowledge",
          "to one's knowledge"
        ],
        [
          "to the best of one's knowledge",
          "to the best of one's knowledge"
        ]
      ]
    }
  ],
  "word": "a son escient"
}

{
  "head_templates": [
    {
      "args": {
        "1": "frm",
        "2": "adverb"
      },
      "expansion": "a son escient",
      "name": "head"
    }
  ],
  "lang": "Middle French",
  "lang_code": "frm",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Middle French adverbs",
        "Middle French entries with incorrect language header",
        "Middle French lemmas",
        "Middle French multiword terms",
        "Middle French terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "Good sirs, you know very well that our custom is that we have to choose who, to the best of our knowledge, has performed the best in the tournament.",
          "ref": "1488, Jean Dupré, Lancelot du Lac, page 59:",
          "text": "Beaux seigneurs vous scavez bien que la coustume de ceans est telle que nous devons eslire cellui a nostre escient qui le mieulx a fait au tournoiement.",
          "type": "quote"
        }
      ],
      "glosses": [
        "to one's knowledge; to the best of one's knowledge"
      ],
      "links": [
        [
          "to one's knowledge",
          "to one's knowledge"
        ],
        [
          "to the best of one's knowledge",
          "to the best of one's knowledge"
        ]
      ]
    }
  ],
  "word": "a son escient"
}