STRATUM

Definition of STRATUM

  1. (noun)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)
  2. (noun)people having the same social, economic, or educational status
  3. (noun)an abstract place usually conceived as having depth
  4. (noun)a subpopulation divided into a stratified sampling