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stratum noun

  /ˈstɹaː.təm/ , /ˈstɹeɪ.təm/ , /ˈstɹæt.əm/ , /ˈstɹɑː.təm/ , [ˈstɹeɪ.ɾəm] , [ˈstɹæɾ.əm]
  • One of several parallel horizontal layers of material arranged one on top of another.
  • (geology) A layer of sedimentary rock having approximately the same composition throughout.
  • Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
  • A class of society composed of people with similar social, cultural, or economic status.
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