"préimage" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "pré-",
        "3": "image"
      },
      "expansion": "pré- + image",
      "name": "af"
    }
  ],
  "etymology_text": "From pré- + image.",
  "forms": [
    {
      "form": "préimages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "préimage f (plural préimages)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French terms prefixed with pré-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Mathematics",
          "orig": "fr:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "preimage"
      ],
      "id": "en-préimage-fr-noun-EHZhE08h",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "preimage",
          "preimage"
        ]
      ],
      "raw_glosses": [
        "(mathematics) preimage"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "préimage"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "pré-",
        "3": "image"
      },
      "expansion": "pré- + image",
      "name": "af"
    }
  ],
  "etymology_text": "From pré- + image.",
  "forms": [
    {
      "form": "préimages",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "préimage f (plural préimages)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French nouns",
        "French terms prefixed with pré-",
        "fr:Mathematics"
      ],
      "glosses": [
        "preimage"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "preimage",
          "preimage"
        ]
      ],
      "raw_glosses": [
        "(mathematics) preimage"
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "préimage"
}