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stratum  (strata plural )
1  n-count A stratum of society is a group of people in it who are similar in their education, income, or social status. 
FORMAL It was an enormous task that affected every stratum of society...  
2  n-count Strata are different layers of rock.  (TECHNICAL) 
Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.