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)
   "The geologist examined the different strata of rock in the canyon wall"
    
2. People having the same social, economic, or educational status
   "the working stratum";
   - class, social class, socio-economic class
    
3. An abstract place usually conceived as having depth
   "the mind functions on many strata simultaneously";
   - level, layer
    
4. A subpopulation divided into a stratified sampling
   "The researchers divided the population into strata based on age groups for more accurate sampling"

Derived forms: strata

Type of: layer, people, place, subpopulation

Part of: class structure, society

Encyclopedia: Stratum, Netherlands