"stratify" in the verb sense
1. stratify
divide society into social classes or castes
"Income distribution often stratifies a society"
2. stratify
form layers or strata
"The rock stratifies"
3. stratify
develop different social levels, classes, or castes
"Society stratifies when the income gap widens"
4. stratify
form, arrange, or deposit in layers
"The fish are stratified in barrels"
"The rock was stratified by the force of the water"
"A statistician stratifies the list of names according to the addresses"
5. stratify
render fertile and preserve by placing between layers of earth or sand
"stratify seeds"
Source: WordNet® (An amazing lexical database of English)
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