Definition of stratum noun from the Oxford Advanced Learner's Dictionary

     

    stratum

     noun
    noun
    BrE BrE//ˈstrɑːtəm//
     
    ; NAmE NAmE//ˈstreɪtəm//
     
    (pl. strata
    BrE BrE//ˈstrɑːtə//
     
    ; NAmE NAmE//ˈstreɪtə//
     
    )
    Belonging to society
     
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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 More Like This Easily-confused plural/​singular forms bacteria/​bacterium, criteria/​criterion, data/​datum, media/​medium, phenomena/​phenomenon, strata/​stratumSee worksheet. See related entries: Belonging to society
  3. Word Origin late 16th cent. (in the sense ‘layer or coat of a substance’): modern Latin, from Latin, literally ‘something spread or laid down’, neuter past participle of sternere ‘strew’.
See the Oxford Advanced American Dictionary entry: stratum