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English definition of “stratum”

stratum

noun [C usually pl]  /ˈstreɪ·t̬əm, ˈstræt̬·əm/ (plural strata    /ˈstreɪ·t̬ə, ˈstræt̬·ə/) us  
a single layer of something: the upper strata of society earth science a single layer of the earth: Engineers could inject seawater into sandy strata beneath the city.
(Definition of stratum from the Cambridge Academic Content Dictionary © Cambridge University Press)
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