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Stratum

usgb/ˈstreɪtəm/Volume
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Broad UsePlay
Stratum can be used metaphorically to describe various types of layers, not just physical ones. SlideHe'd worked through every stratum of the company to become CEO.
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Hierarchy ImplicationPlay
'Stratum' often implies a hierarchy, with higher strata at the top and lower ones beneath. SlideShe aimed to move up to a higher stratum with her extensive training.