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Word: stratum
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Meaning:
Noun:
- A class of society composed of people with similar social, cultural, or economic status
- Any of the regions of the atmosphere, such as the stratosphere, that occur as layers
- biology A layer of tissue
- ecology A layer of vegetation, usually of similar height.
- geology A layer of sedimentary rock having approximately the same composition throughout
- One of several parallel horizontal layers of material arranged one on top of another
Source: Wiktionary
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