Definition of stratum noun from the Oxford Advanced American Dictionary

     

    stratum

     noun
    noun
    NAmE//ˈstreɪt̮əm//
     
    , NAmE//ˈstræt̮əm//
     
    (pl. strata
    NAmE//ˈstreɪt̮ə//
     
    , NAmE//ˈstræt̮ə//
     
    )
     
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  1. 1(geology) a layer or set of layers of rock, earth, etc. a thick stratum of flint limestone strata Excavated coins can often be dated from other objects in the same stratum.
  2. 2(formal) a class in a society people from all social strata
See the Oxford Advanced Learner's Dictionary entry: stratum