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   Stra·tum

   /ˈstrādəm/

   

   noun

   • 1. a layer or a series of layers of rock in the ground: "a stratum of flint" Similar layerveinseamlodebedstratificationthicknesssheetlamina
   • ▪ 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" Similar levelclassechelonrankgradestationgradationgroupsetbracketcastearchaic:estatesphere
   • ▪ a group into which members of a population are divided in stratified sampling: "allocation of sample units to strata"

   Word Origin late 16th century (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’.

   Scrabble Points: 9

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