"substantifièrent" meaning in Français

{
  "anagrams": [
    {
      "word": "resubstantifient"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Formes de verbes en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "ils/elles substantifièrent"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "substantifier"
        }
      ],
      "glosses": [
        "Troisième personne du pluriel du passé simple du verbe substantifier."
      ],
      "id": "fr-substantifièrent-fr-verb-NYjavY1D"
    }
  ],
  "sounds": [
    {
      "ipa": "\\syb.stɑ̃.ti.fjɛʁ\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "substantifièrent"
}

{
  "anagrams": [
    {
      "word": "resubstantifient"
    }
  ],
  "categories": [
    "Formes de verbes en français",
    "français"
  ],
  "forms": [
    {
      "form": "ils/elles substantifièrent"
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "verb",
  "pos_title": "Forme de verbe",
  "senses": [
    {
      "form_of": [
        {
          "word": "substantifier"
        }
      ],
      "glosses": [
        "Troisième personne du pluriel du passé simple du verbe substantifier."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\syb.stɑ̃.ti.fjɛʁ\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "substantifièrent"
}