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)

Definition categories: location, layer

2. people having the same social, economic, or educational status

Similar word(s): class

Definition categories: group, people

3. an abstract place usually conceived as having depth

- the mind functions on many strata simultaneously

Similar word(s): layer, level

Definition categories: thought, place

4. a subpopulation divided into a stratified sampling

Definition categories: thought, subpopulation