
An isogloss—also called a heterogloss (see Etymology below)—is the geographic boundary of a certain linguistic feature, such as the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. Major dialects are typically demarcated by groups of isoglosses; for example the Benrath line distinguishes High German from the o...
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http://en.wikipedia.org/wiki/Isogloss

line connecting points of similar regional dialect
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http://phrontistery.info/i.html

(from the article `dialect`) ...between neighbouring local dialects are usually small, but, in travelling farther in the same direction, differences accumulate. Every dialectal ... ...from neighbouring dialects. It became more and more clear that each dialectal element or phenomenon refused to stay neatly within the borders of a ... ...
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http://www.britannica.com/eb/a-z/i/44

When linguists create maps showing where dialects are spoken, the isoglosses would be the boundary l
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http://www.encyclo.co.uk/local/22385

isogloss 1. In linguistics, a speech area in which a line between places that delimits any feature of language; such as, pronunciation, inflection, vocabulary, or syntax is shown. 2. The geographical range of a given word, pronunciation, or usage.
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http://www.wordinfo.info/words/index/info/view_unit/2795/4

(in the study of the geographical distribution of dialects) a line on a map marking the limits of an area within which a feature of speech occurs, as the use of a particular word or pronunciation.
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https://www.infoplease.com/dictionary/isogloss
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