- 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. - A bed or layer artificially made; a course.
Meaning of 'stratum' (Princeton's WordNet)
1 . stratum
[ n]
Meaning (1): - an abstract place usually conceived as having depth
Example in sentence:
a good actor communicates on several levels;
a simile has at least two layers of meaning;
the mind functions on many strata simultaneously
Meaning (2): - people having the same social, economic, or educational status