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A stratum is a ...

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GPT-4o mini
A stratum is a layer or level within a structure or system. In various contexts, it can refer to:

1. **Geology**: A layer of rock or sediment with internally consistent characteristics that distinguish it from other layers.

2. **Sociology**: A social stratum refers to a distinct social class or group within a society, often defined by socioeconomic status, education, or occupation.

3. **Statistics**: In stratified sampling, a stratum is a subset of the population that is selected to ensure that different segments are represented in the sample.

4. **Biology**: Layers of tissues or cells, as seen in biological organisms.

5. **Architecture and Construction**: Different layers of materials or construction methods used in building structures.

The term can vary in meaning depending on the context, but it generally denotes a level within a hierarchy or system.