Homonym: stratum (Layer)
A "stratum" is a layer or level within a structure, often used in fields like geology, sociology, and biology. In geology, strata refer to layers of rock or sediment that have formed over time, providing insights into Earth's history. Each stratum can contain different types of fossils, minerals, or other materials, helping scientists understand past environments.
In sociology, a stratum can refer to a social class or group within a society. For example, the upper class, middle class, and lower class represent different strata based on factors like income, education, and occupation. Understanding these strata helps analyze social dynamics and inequalities.