"虚数" meaning in Japanese

{
  "forms": [
    {
      "form": "虚数",
      "ruby": [
        [
          "虚",
          "きょ"
        ],
        [
          "数",
          "すう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kyosū",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "きょすう"
      },
      "expansion": "虚(きょ)数(すう) • (kyosū)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ja",
          "name": "Complex analysis",
          "orig": "ja:Complex analysis",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ja",
          "name": "Numbers",
          "orig": "ja:Numbers",
          "parents": [
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "an imaginary number"
      ],
      "id": "en-虚数-ja-noun-u51WwDAe",
      "links": [
        [
          "imaginary number",
          "imaginary number"
        ]
      ],
      "related": [
        {
          "roman": "kyosū tan'i",
          "ruby": [
            [
              "虚",
              "きょ"
            ],
            [
              "数",
              "すう"
            ],
            [
              "単",
              "たん"
            ],
            [
              "位",
              "い"
            ]
          ],
          "word": "虚数単位"
        },
        {
          "roman": "fukusosū",
          "ruby": [
            [
              "複",
              "ふく"
            ],
            [
              "素",
              "そ"
            ],
            [
              "数",
              "すう"
            ]
          ],
          "word": "複素数"
        },
        {
          "roman": "jissū",
          "ruby": [
            [
              "実",
              "じっ"
            ],
            [
              "数",
              "すう"
            ]
          ],
          "word": "実数"
        }
      ],
      "wikipedia": [
        "ja:虚数"
      ]
    }
  ],
  "sounds": [
    {
      "other": "きょすう"
    },
    {
      "ipa": "[kʲo̞sɨᵝː]"
    }
  ],
  "word": "虚数"
}

{
  "forms": [
    {
      "form": "虚数",
      "ruby": [
        [
          "虚",
          "きょ"
        ],
        [
          "数",
          "すう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "kyosū",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "きょすう"
      },
      "expansion": "虚(きょ)数(すう) • (kyosū)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "related": [
    {
      "roman": "kyosū tan'i",
      "ruby": [
        [
          "虚",
          "きょ"
        ],
        [
          "数",
          "すう"
        ],
        [
          "単",
          "たん"
        ],
        [
          "位",
          "い"
        ]
      ],
      "word": "虚数単位"
    },
    {
      "roman": "fukusosū",
      "ruby": [
        [
          "複",
          "ふく"
        ],
        [
          "素",
          "そ"
        ],
        [
          "数",
          "すう"
        ]
      ],
      "word": "複素数"
    },
    {
      "roman": "jissū",
      "ruby": [
        [
          "実",
          "じっ"
        ],
        [
          "数",
          "すう"
        ]
      ],
      "word": "実数"
    }
  ],
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with two Han script characters",
        "ja:Complex analysis",
        "ja:Numbers"
      ],
      "glosses": [
        "an imaginary number"
      ],
      "links": [
        [
          "imaginary number",
          "imaginary number"
        ]
      ],
      "wikipedia": [
        "ja:虚数"
      ]
    }
  ],
  "sounds": [
    {
      "other": "きょすう"
    },
    {
      "ipa": "[kʲo̞sɨᵝː]"
    }
  ],
  "word": "虚数"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "虚数"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "虚数",
  "trace": ""
}