Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Modern Latin
Origin: Latin, 'something spread, bed', from sternere 'to spread out'

stratum

 noun
     
Related topics: Geology, Sociology
stra‧tum plural strata [countable]
1HEG a layer of rock or earth
2SS a social class in a society:
people of different social strata
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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