transcription, транскрипция: [ strɑ:təm, AM streɪtəm ]
( strata)
1.
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...
N-COUNT : usu with supp
2.
Strata are different layers of rock. ( TECHNICAL )
Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.
N-COUNT : usu pl