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From: Webster's Revised Unabridged Dictionary (1913)

 Stra·tum n.; pl. E. Stratums L. Strata The latter is more common.
 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.
 2. A bed or layer artificially made; a course.