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”可以指:

  • 阶 (地层),年代地层学上的基本地层单位,对应于地质年代中的期,某一阶即是某一期沉积的地层
  • 階姓,台湾特有的罕见姓氏
  • 数学概念(英语:order):
    • 阶 (群论),群的元素个数
    • 微分方程的阶,方程出现导数的最高次数
    • 零点的阶,函数 阶零点 附近, 大致与 成正比
    • 极点的阶,函数 阶极点 附近, 大致与 成正比
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