stratification

Noun
  1. The act or process or arranging persons into classes or social strata (synset 101015546)
  2. The condition of being arranged in social strata or classes within a group (synset 113962191)
  3. Forming or depositing in layers (synset 113583531)
  4. A layered configuration (synset 105081859)
  5. The placing of seeds in damp sand or sawdust or peat moss in order to preserve them or promote germination (synset 100921691)

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