1. (noun)
stratum
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)
2. (noun)
class, stratum, social class, socio-economic class
people having the same social, economic, or educational status
"the working class"; "an emerging professional class"
3. (noun)
level, layer, stratum
an abstract place usually conceived as having depth
"a good actor communicates on several levels"; "a simile has at least two layers of meaning"; "the mind functions on many strata simultaneously"
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