Stratification - Definition

n 1: the act or process or arranging persons into classes or
social strata
2: the condition of being arranged in social strata or classes
within a group [syn: stratification, social
stratification]
3: forming or depositing in layers
4: a layered configuration
5: the placing of seeds in damp sand or sawdust or peat moss in
order to preserve them or promote germination