the word 'stratify' originates from the modern latin term 'stratificare', which itself is built upon the latin noun 'stratum', meaning a layer or a covering. this noun derives from the verb 'sternere', to spread out or lay down, a concept with deep roots in proto-indo-European as sterh₃-, meaning to stretch or extend. the suffix '-ify', entering english via old french, provides the sense of 'to make'. thus, the literal construction 'to make into layers' perfectly captures the modern meanings, whether describing geological sedimentation or the sociological division of a population into hierarchical groups.

Structure: strat (layer) + ify (verb suffix) strat (from latin 'stratum', meaning a layer or something spread out); ify (a verb-forming suffix from latin '-ificare', via old french '-ifier', meaning to make or cause to become).