Main entry: stratum, layer, level
Definition: an abstract place usually conceived as having depth
Usage: a good actor communicates on several levels; a simile has at least two layers of meaning; the mind functions on many strata simultaneously
Main entry: social class, socio-economic class, class, stratum
Definition: people having the same social, economic, or educational status
Usage: the working class; an emerging professional class
Main entry: stratum
Definition: 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)