Stratification 169837 212491434 2008-05-15T00:38:23Z 67.11.33.138 {{wiktionary}} '''Stratification''' is the building up of layers, and can have several meanings *[[Social stratification]], is the dividing of a [[society]] into levels based on [[wealth]] or [[Power (sociology)|power]]. *[[Stratification (archeology)|Stratification]] in [[archaeology]] is the formation of layers (strata) in which objects are found. *Stratification of [[Rock (geology)|rock]] layers ([[stratum|strata]]) is part of the [[geologic]] field of [[Stratigraphy]]. *[[Stratification (botany)]], where seeds are pretreated to simulate winter conditions so that [[germination]] may occur. *See [[stratified sampling]] for the use of ''stratification'' in [[survey sampling]]. The term "stratified sampling" also refers a method of variance reduction in [[Monte Carlo method]]s. *In [[logic]], [[Stratification (mathematics)|stratification]] is a layering of predicate symbols to guarantee unique interpretations and to avoid paradoxical definitions like [[Russell's paradox]]. *In [[mathematics]], [[Stratification (mathematics)|Stratification]] has a separate meaning as applied to [[manifold]]s, and [[singularity theory]], of a decomposition into pieces with specified relationships on fitting together. *In [[music]] [[stratification (music)|stratification]] is a layering of [[musical texture]] or the independent operating of more than one [[parameter]] [[simultaneity|simultaneously]] (see [[auditory stream]]). *In [[meteorology]], [[atmospheric stratification]] is the division of the [[Earth's atmosphere|atmosphere]] into distinct layers, each with specific properties such as temperature or humidity. * In [[histology]], ''stratified'' [[epithelium]] refers to epithelium that consists of two or more layers of epithelial cells, in contrast to ''simple'' epithelium, which only has one layer. * [[genetic association|Genetic stratification]] *[[Stratification (water)]] can occur due to gradients in salinity or temperature, e.g. [[lake stratification]]. *Stratification of air — unmixed air within a confined space that is separated into thermal layers due to temperature variations. *A way an internal combustion operates, when [[Gasoline direct injection|direct injection]] is used to burn fuel just at the sparkplug and keep in the rest of the cylinder plain air. This reduces fuel consumption significantly. == See also == * [[Destratification]] * [[Partition]] {{disambig}} [[cs:Stratifikace]] [[de:Stratifikation]] [[nl:Stratificatie]] [[pt:Estratificação]]