Jisho

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Noun
1. isoglossLinguistics
Wikipedia definition
2. IsoglossAn isogloss—also called a heterogloss—is the geographical 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 other West Germanic languages; and the La Spezia-Rimini Line divides the Northern Italian dialects from Central Italian dialects.
Read “Isogloss” on English Wikipedia
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Read “Isogloss” on DBpedia

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