What is the meaning of Stratum?

One of several parallel horizontal layers of material arranged one on top of another.

A layer of sedimentary rock having approximately the same composition throughout.

Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.

A layer of tissue.

A class of society composed of people with similar social, cultural, or economic status.

A layer of vegetation, usually of similar height.

The level of accuracy of a computer's clock, relative to others on the network.

stratum

stratum, a layer of sedimentary rock having approximately the same composition throughout.

a bed-covering, coverlet, quilt, blanket

a pillow, bolster

a bed, couch

a horse-blanket, saddle-cloth

a pavement

accusative supine of sternō

Source: wiktionary.org