Longman Dictionary of Contemporary English homepage

stratification

 noun
     
strat‧i‧fi‧ca‧tion [uncountable and countable]
1XX when society is divided into separate social classes:
The Indian caste system is an example of social stratification.
2 the way in which earth, rocks etc form layers over time
—stratify verb [intransitive and transitive]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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