"nomen relativum" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "-"
      },
      "expansion": "Latin",
      "name": "uder"
    }
  ],
  "etymology_text": "Latin",
  "forms": [
    {
      "form": "nomina relativa",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "nomina relativa"
      },
      "expansion": "nomen relativum (plural nomina relativa)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "glosses": [
        "a relative adjective"
      ],
      "id": "en-nomen_relativum-en-noun-K4XzXGDo",
      "links": [
        [
          "relative",
          "relative"
        ],
        [
          "adjective",
          "adjective"
        ]
      ],
      "raw_glosses": [
        "(Arabic grammar) a relative adjective"
      ],
      "tags": [
        "Arabic"
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "nomen relativum"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "la",
        "3": "-"
      },
      "expansion": "Latin",
      "name": "uder"
    }
  ],
  "etymology_text": "Latin",
  "forms": [
    {
      "form": "nomina relativa",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "nomina relativa"
      },
      "expansion": "nomen relativum (plural nomina relativa)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from Latin",
        "English undefined derivations"
      ],
      "glosses": [
        "a relative adjective"
      ],
      "links": [
        [
          "relative",
          "relative"
        ],
        [
          "adjective",
          "adjective"
        ]
      ],
      "raw_glosses": [
        "(Arabic grammar) a relative adjective"
      ],
      "tags": [
        "Arabic"
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "nomen relativum"
}