STRATUM
- layer of material
- a bed or layer artificially made
- sheetlike mass of sedimentary rock or earth of one kind lying between beds of other kinds
- region of the sea or atmosphere that is analogous to a stratum of the earth
- layer of tissue deep stratum of the skin
- a layer of material [n STRATA, STRATUMS]
- part of a historical or sociological series representing a period or a stage of development
- socioeconomic level of society comprising persons of the same or similar status especially with regard to education or culture
- statistical subpopulation
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