usage: divide society into social classes or castes; "Income distribution often stratifies a society"
2. stratify, arrange, set up
usage: form layers or strata; "The rock stratifies"
3. stratify, change
usage: develop different social levels, classes, or castes; "Society stratifies when the income gap widens"
4. stratify, put, set, place, pose, position, lay
usage: 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"