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Stratum

ˈstrɑːtəm

Stratum definitions
noun
strata stratum
  1. a layer or a series of layers of rock in the ground

    "a stratum of flint"

    • a thin layer within any structure

      "thin strata of air"

  2. a level or class to which people are assigned according to their social status, education, or income

    "members of other social strata"

    • a group into which members of a population are divided in stratified sampling

      "allocation of sample units to strata"