Isogloss

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Isoglosses on the Faroe Islands
Isoglosses on the Faroe Islands
High German subdivides into Upper German (green) and Central German (blue), and is distinguished from Low Franconian and Low German (yellow).  The main isoglosses, the Benrath and Speyer lines are marked in black.
High German subdivides into Upper German (green) and Central German (blue), and is distinguished from Low Franconian and Low German (yellow). The main isoglosses, the Benrath and Speyer lines are marked in black.

An isogloss is the geographical boundary of a certain linguistic feature, e.g. the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. Major dialects are typically demarcated by whole bundles of isoglosses, e.g. the Benrath line that distinguishes High German from the other West Germanic languages; or the La Spezia-Rimini Line which divides the eastern Romance languages from the western ones. Undoubtedly, the largest well-known isogloss is the Centum-Satem isogloss, which traditionally separates the Indo-European languages into two distinct categories.

The name is inspired by contour lines or isopleths such as isobar, etc.; however, the isogloss separates rather than connects points of equal language (perhaps one could say it connects points of indefinite language).

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