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WordNet (r) 3.0 (2006) (WordNet)

stratify
v 1: divide society into social classes or castes; "Income
distribution often stratifies a society"
2: form layers or strata; "The rock stratifies"
3: develop different social levels, classes, or castes; "Society
stratifies when the income gap widens"
4: 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: render fertile and preserve by placing between layers of
earth or sand; "stratify seeds"