"seisan" meaning in 日语

{
  "categories": [
    {
      "kind": "other",
      "name": "日語羅馬化",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語非詞元形式",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "有1個詞條的頁面",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "有詞條的頁面",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "日语",
  "lang_code": "ja",
  "pos": "romanization",
  "senses": [
    {
      "form_of": [
        {
          "word": "せいさん"
        }
      ],
      "glosses": [
        "せいさん 的罗马字转写"
      ],
      "id": "zh-seisan-ja-romanization-S3bULYxF",
      "tags": [
        "form-of"
      ]
    }
  ],
  "word": "seisan"
}

{
  "categories": [
    "日語羅馬化",
    "日語非詞元形式",
    "有1個詞條的頁面",
    "有詞條的頁面"
  ],
  "lang": "日语",
  "lang_code": "ja",
  "pos": "romanization",
  "senses": [
    {
      "form_of": [
        {
          "word": "せいさん"
        }
      ],
      "glosses": [
        "せいさん 的罗马字转写"
      ],
      "tags": [
        "form-of"
      ]
    }
  ],
  "word": "seisan"
}