What does strata mean?
Strata is the plural form of stratum and most commonly refers to layers of rock, sediment, or soil formed over geological time. The singular stratum is one such layer, while strata describes a sequence or system of layers. The word also has a figurative use for levels within a society, organization, or other hierarchy: for example, income strata or occupational strata. In these contexts, strata emphasizes structure and relative position rather than simply individual groups. Because strata is already plural, it normally takes a plural verb, as in “the strata are clearly visible,” although usage can vary when the word is treated collectively. It is especially common in geology, geology-related writing, and formal social analysis.
noun (plural)Plural of stratum: a layer or series of layers of rock, sediment, soil, or other material. It is also used figuratively for distinct levels within a society, organization, or system.
- Layers of rock, sediment, soil, or other material, especially when considered as a geological formation.
- Distinct levels or divisions within a society, community, organization, or other social structure.
- A series of levels or bands in which something is arranged or classified.
"The cliffs are composed of layers of sedimentary strata that record millions of years of geological history."
"Fossils found in the upper strata helped scientists date the cliffs more precisely."
"The study found wide inequalities between the highest and lowest strata of the labor market."
Strata is the standard plural of stratum and is normally used as a plural noun.
"The sedimentary strata reveal a sequence of ancient climates."
A single word can move from the layers of rock beneath our feet to the layers of society above them.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does strata come from?
Strata comes from Latin strata, the plural of stratum, meaning “layer” or “bed.” Latin stratum itself is related to sternere, “to spread out” or “to strew.” English borrowed the Latin forms and developed related words such as stratal, stratify, and stratiform, all belonging to the same family of words concerning layers or layered organization.
Related word forms
How strata is actually used
Strata is normally plural. Use stratum for one layer or level. In social contexts, the word can sound more formal or analytical than alternatives such as groups or levels.
Easily confused with strata
Stratum is the singular form, while strata is its usual plural, especially when referring to geological layers or levels in a social system.
Strata usually means layers or levels, whereas stratus is a type of cloud characterized by a broad, low, sheetlike formation.