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stratum (n.)

"horizontal layer," 1590s, from Modern Latin special use of Latin stratum "thing spread out, coverlet, bedspread, horse-blanket; pavement," noun uses of neuter of stratus "prostrate, prone," past participle of sternere "to spread out, lay down, stretch out," from nasalized form of PIE root *stere- "to spread."

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Definitions of stratum from WordNet

stratum (n.)
one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock);
stratum (n.)
people having the same social, economic, or educational status;
Synonyms: class / social class / socio-economic class
stratum (n.)
an abstract place usually conceived as having depth;
the mind functions on many strata simultaneously
Synonyms: level / layer
stratum (n.)
a subpopulation divided into a stratified sampling;
From wordnet.princeton.edu