"-un-" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "la",
        "3": "ūnus",
        "4": "",
        "5": "one"
      },
      "expansion": "Borrowed from Latin ūnus (“one”)",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from Latin ūnus (“one”).",
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "infix"
      },
      "expansion": "-un-",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "infix",
  "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 infixes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 7 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Chemistry",
          "orig": "fr:Chemistry",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "-un-"
      ],
      "id": "en--un--fr-infix-2W2Sm-DJ",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "-un-",
          "-un-#English"
        ]
      ],
      "raw_glosses": [
        "(chemistry) -un-"
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "-un-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "la",
        "3": "ūnus",
        "4": "",
        "5": "one"
      },
      "expansion": "Borrowed from Latin ūnus (“one”)",
      "name": "bor+"
    }
  ],
  "etymology_text": "Borrowed from Latin ūnus (“one”).",
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "infix"
      },
      "expansion": "-un-",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "infix",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French infixes",
        "French lemmas",
        "French terms borrowed from Latin",
        "French terms derived from Latin",
        "Pages with 7 entries",
        "Pages with entries",
        "fr:Chemistry"
      ],
      "glosses": [
        "-un-"
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "-un-",
          "-un-#English"
        ]
      ],
      "raw_glosses": [
        "(chemistry) -un-"
      ],
      "tags": [
        "morpheme"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "-un-"
}