[{"Bold_text": "noun", "List Items": ["the act or an instance of stratifying.", "a stratified state or appearance:the stratification of ancient ruins from eight different periods.", "Also calledso?cial stratifica?tion.Sociology.the hierarchical or vertical division of society according to rank, caste, or class:stratification of feudal society.", "Geology.formation of strata; deposition or occurrence in strata.a stratum.", "formation of strata; deposition or occurrence in strata.", "a stratum."]}]