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Definition of stratum:

  1. In geol., a bed; a layer; a great extent of rock or other earthy substance lying in the crust of the earth in a flattish form, varying from a few inches to many yards in depth.


footing, course of instruction, ranking, story, social class, echelon, layer, horizontal surface, course, bed, caste, sediment, order, stage, gentry, floor, place, point, rank, class, division, reach, status, spirit level, estate, rock, outcrop, grade, steppingstone, year, level, folk, rung, tier, family, socio-economic class, stone, course of study, deposit, standing, situation, position, category, station, bedrock, form, aquifer, degree, storey.

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