1. One of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock) (synset 108674880)
  2. People having the same social, economic, or educational status (synset 107990472)
    "the working class"; "an emerging professional class"
  3. An abstract place usually conceived as having depth (synset 106257026)
    "a good actor communicates on several levels"; "a simile has at least two layers of meaning"; "the mind functions on many strata simultaneously"
  4. A subpopulation divided into a stratified sampling (synset 106036690)

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