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English definition of “stratum”

stratum

noun [C]     /ˈstrɑː.təm/ US  /ˈstræ.t̬əm/ (plural strata)
one of the parts or layers into which something is separated : The report shows that drugs have penetrated every stratum of American society .Coverings and layers specialized geology a layer of rock , soil , or similar material : The cliffs are characterized by remarkable zigzagging strata of shale and sandstone .Coverings and layers
(Definition of stratum noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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