"等差数列" meaning in Japanese

{
  "forms": [
    {
      "form": "等差数列",
      "ruby": [
        [
          "等",
          "とう"
        ],
        [
          "差",
          "さ"
        ],
        [
          "数",
          "すう"
        ],
        [
          "列",
          "れつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "tōsasūretsu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "とうさすうれつ"
      },
      "expansion": "等(とう)差(さ)数(すう)列(れつ) • (tōsasūretsu)",
      "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": "Mathematics",
          "orig": "ja:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "arithmetic sequence, arithmetic progression"
      ],
      "id": "en-等差数列-ja-noun-tb6xxKqQ",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "arithmetic",
          "arithmetic"
        ],
        [
          "sequence",
          "sequence"
        ],
        [
          "progression",
          "progression"
        ]
      ],
      "raw_glosses": [
        "(mathematics) arithmetic sequence, arithmetic progression"
      ],
      "related": [
        {
          "roman": "tōhisūretsu",
          "ruby": [
            [
              "等",
              "とう"
            ],
            [
              "比",
              "ひ"
            ],
            [
              "数",
              "すう"
            ],
            [
              "列",
              "れつ"
            ]
          ],
          "word": "等比数列"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "other": "とーさすうれつ"
    },
    {
      "ipa": "[to̞ːsa̠sɨᵝːɾe̞t͡sɨᵝ]"
    }
  ],
  "word": "等差数列"
}

{
  "forms": [
    {
      "form": "等差数列",
      "ruby": [
        [
          "等",
          "とう"
        ],
        [
          "差",
          "さ"
        ],
        [
          "数",
          "すう"
        ],
        [
          "列",
          "れつ"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "tōsasūretsu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "とうさすうれつ"
      },
      "expansion": "等(とう)差(さ)数(すう)列(れつ) • (tōsasūretsu)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "related": [
    {
      "roman": "tōhisūretsu",
      "ruby": [
        [
          "等",
          "とう"
        ],
        [
          "比",
          "ひ"
        ],
        [
          "数",
          "すう"
        ],
        [
          "列",
          "れつ"
        ]
      ],
      "word": "等比数列"
    }
  ],
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with fourth grade kanji",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with non-redundant non-automated sortkeys",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with four Han script characters",
        "ja:Mathematics"
      ],
      "glosses": [
        "arithmetic sequence, arithmetic progression"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "arithmetic",
          "arithmetic"
        ],
        [
          "sequence",
          "sequence"
        ],
        [
          "progression",
          "progression"
        ]
      ],
      "raw_glosses": [
        "(mathematics) arithmetic sequence, arithmetic progression"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "other": "とーさすうれつ"
    },
    {
      "ipa": "[to̞ːsa̠sɨᵝːɾe̞t͡sɨᵝ]"
    }
  ],
  "word": "等差数列"
}

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