stratify

Verb

• render fertile and preserve by placing between layers of earth or sand
  • stratify seeds
    

• 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
    

• develop different social levels, classes, or castes
  • Society stratifies when the income gap widens
    

• form layers or strata
  • The rock stratifies
    

• divide society into social classes or castes
  • Income distribution often stratifies a society