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1. Oxford American Dictionary

   stratum

   • IPA[ˈstrādəm]

   美式

   • n.
     a layer or a series of layers of rock in the ground；a thin layer within any structure

   • noun: stratum, plural noun: strata

2. • 釋義

   n.

   名詞

   • 1. a layer or a series of layers of rock in the ground a stratum of flint 同義詞 layer, vein, seam, lode, bed, ... 更多stratification, thickness, sheet, lamina
   • ▪ a thin layer within any structure thin strata of air
   • 2. a level or class to which people are assigned according to their social status, education, or income members of other social strata 同義詞 level, class, echelon, rank, grade, ... 更多station, gradation, group, set, bracket, caste, archaicestate, sphere
   • ▪ a group into which members of a population are divided in stratified sampling allocation of sample units to strata