Толковый словарь английского языка Oxford English Reference - stratum
Stratum
stratum
n. (pl. strata) 1 esp. Geol. a layer or set of successive layers of any deposited substance. 2 an atmospheric layer. 3 a layer of tissue etc. 4 a a social grade, class, etc. (the various strata of society). b Statistics each of the groups into which a population is divided in stratified sampling. Derivatives stratal adj. Etymology: L, = something spread or laid down, neut. past part. of sternere strew
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1.
noun (plural strata) see: strew Date: 1599 a bed or layer artificially made, 2. a sheetlike mass of sedimentary rock or earth of one kind lying between beds of other kinds, a region of the sea or atmosphere that is analogous to a ~ of the earth, a layer of tissue , a layer in which archaeological material (as artifacts, skeletons, and dwelling remains) is found on excavation, 3. a part of a historical or sociological series representing a period or a stage of development, a socioeconomic level of society comprising persons of the same or similar status especially with regard to education or culture, one of a series of layers, levels, or gradations in an ordered system , a statistical subpopulation, Usage: The plural strata has occasionally been used as a singular since the 18th century and is sometimes given the plural stratas . Current evidence shows senses 2, 3b, and 4 so used, with 3b the most common. Singular strata is persistent but not frequent. Strata may someday establish itself as a singular like agenda, but that use is still not established. ...Толковый словарь английского языка
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