Stratum (linguistics)

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In linguistics, a stratum (Latin for "layer") or strate is a historical layer of language that influences or is influenced by another language through contact. The notion of "strata" was first developed by the Italian linguist Graziadio Isaia Ascoli (1829–1907), and became known in the English-speaking world through the work of two different authors in 1932.^[1]

Both concepts apply to a situation where an intrusive language establishes itself in the territory of another, typically as the result of migration. Whether the superstratum case (the local language persists and the intrusive language disappears) or the substratum one (the local language disappears and the intrusive language persists) applies will normally only be evident after several generations, during which the intrusive language exists within a diaspora culture. In order for the intrusive language to persist (substratum case), the immigrant population will either need to take the position of a political elite or immigrate in significant numbers relative to the local population, i.e., the intrusion qualifies as an invasion or colonisation. An example would be the Roman Empire giving rise to Romance languages outside Italy, displacing Gaulish and many other Indo-European languages.

The superstratum case refers to elite invading populations, that eventually adopt the language of the native lower classes. An example would be the Burgundians and Franks in France, who eventually abandoned their Germanic dialects in favor of other Indo-European languages of the Romance branch, profoundly influencing the local speech in the process.