1. (noun) stratum
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)
Synonyms: socio-economic class, social class, level, class, layer
2. (noun) class, stratum, social class, socio-economic class
people having the same social, economic, or educational status
Synonyms: social class, layer, level, grade, form, category, class, socio-economic class, course of instruction, course of study, division, course, stratum, year, family
3. (noun) level, layer, stratum
an abstract place usually conceived as having depth
Synonyms: horizontal surface, grade, storey, degree, tier, story, class, point, spirit level, social class, layer, socio-economic class, bed, floor, stage, level, stratum
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Synonyms and Antonyms of stratum 
