stratum

stra|tum /str'ɑːtəm, AM str'eɪtəm/ (strata)
1 [N-COUNT] usu with supp
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] usu pl
Strata are different layers of rock. (TECHNICAL)
Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.

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