'Stratum' definitions:

Definition of 'stratum'

From: WordNet
noun
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)
noun
People having the same social, economic, or educational status; "the working class"; "an emerging professional class" [syn: class, stratum, social class, socio-economic class]
noun
An abstract place usually conceived as having depth; "a good actor communicates on several levels"; "a simile has at least two layers of meaning"; "the mind functions on many strata simultaneously" [syn: level, layer, stratum]

Definition of 'Stratum'

From: GCIDE
  • Stratum \Stra"tum\, n.; pl. E. Stratums, L. Strata. The latter is more common. [L., from sternere, stratum, to spread; akin to Gr. ? to spread, strew. See Strew, and cf. Consternation, Estrade, Prostrate, Stratus, Street.]
  • 1. (Geol.) A bed of earth or rock of one kind, formed by natural causes, and consisting usually of a series of layers, which form a rock as it lies between beds of other kinds. Also used figuratively. [1913 Webster]
  • 2. A bed or layer artificially made; a course. [1913 Webster]

Synonyms of 'stratum'

From: Moby Thesaurus