"datum plane" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "待分類的英語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "拉丁文字",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "測繪學專有名詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英语名词",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "unknown",
  "senses": [
    {
      "glosses": [
        "基准面\n* 简体: 基准面[测绘学]\n* 正體: 基準面[測量學]"
      ],
      "id": "zh-datum_plane-en-unknown-IcG2Rmj1"
    }
  ],
  "word": "datum plane"
}

{
  "categories": [
    "待分類的英語詞",
    "拉丁文字",
    "測繪學專有名詞",
    "英語",
    "英语名词"
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "unknown",
  "senses": [
    {
      "glosses": [
        "基准面\n* 简体: 基准面[测绘学]\n* 正體: 基準面[測量學]"
      ]
    }
  ],
  "word": "datum plane"
}