Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A horizontal layer of material, especially one of several parallel layers arranged one on top of another.
  • n. Geology A bed or layer of sedimentary rock having approximately the same composition throughout.
  • n. Any of the regions of the atmosphere, such as the troposphere, that occur as layers.
  • n. Biology A layer of tissue: the epithelial stratum.
  • n. A level of society composed of people with similar social, cultural, or economic status.
  • n. One of a number of layers, levels, or divisions in an organized system: a complex poem with many strata of meaning.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One of several parallel horizontal layers of material arranged one on top of another.
  • n. A layer of sedimentary rock having approximately the same composition throughout.
  • n. Any of the regions of the atmosphere, such as the stratosphere, that occur as layers.
  • n. A layer of tissue.
  • n. A class of society composed of people with similar social, cultural, or economic status.
  • n. A layer of vegetation, usually of similar height.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.
  • n. A bed or layer artificially made; a course.

from The Century Dictionary and Cyclopedia

  • n. A layer of material, formed either naturally or artificially.
  • n. In archæol. excavations, one of the layers of deposits left by successive civilizations, as in the overlying cities at Hissarlik, the ancient Troy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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)
  • n. people having the same social, economic, or educational status
  • n. an abstract place usually conceived as having depth

Etymologies

Latin strātum, a covering, from neuter past participle of sternere, to spread; see stratus.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin strātum ("a spread for a bed, coverlet, quilt, blanket; a pillow, bolster; a bed"), neuter singular of strātus, perfect passive participle of sternō ("spread"). (Wiktionary)

Examples

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