"real line" meaning in English

{
  "forms": [
    {
      "form": "real lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "real line (plural real lines)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Infinity",
          "orig": "en:Infinity",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Shapes",
          "orig": "en:Shapes",
          "parents": [
            "Geometry",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The real number system, viewed as a line."
      ],
      "holonyms": [
        {
          "word": "real plane"
        }
      ],
      "id": "en-real_line-en-noun-z0f16dXv",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "real number system",
          "real number system"
        ],
        [
          "line",
          "line"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The real number system, viewed as a line."
      ],
      "synonyms": [
        {
          "word": "real number line"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "real numbers viewed as a line",
          "word": "reaalisuora"
        }
      ],
      "wikipedia": [
        "real line"
      ]
    }
  ],
  "word": "real line"
}

{
  "forms": [
    {
      "form": "real lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "real line (plural real lines)",
      "name": "en-noun"
    }
  ],
  "holonyms": [
    {
      "word": "real plane"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Infinity",
        "en:Mathematics",
        "en:Shapes"
      ],
      "glosses": [
        "The real number system, viewed as a line."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "real number system",
          "real number system"
        ],
        [
          "line",
          "line"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The real number system, viewed as a line."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "real line"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "real number line"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "real numbers viewed as a line",
      "word": "reaalisuora"
    }
  ],
  "word": "real line"
}