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Stratum
ˈstrɑːtəm
Stratum definitions
noun
strata
stratum
- 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"
- 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"