- The definition of an isogloss is a line on a map that marks the boundary between areas where language features are different.
An example of an isogloss is the line on a map that shows the division of two populations which have different pronunciations for a a specific vowel.
- a line of demarcation between regions differing in a particular feature of language, as on a point of pronunciation, vocabulary, etc.
- such a line indicated on a map
Origin of isogloss; from iso- + Classical Greek glōssa, tongue, speech: see gloss
Origin of isoglossiso– + Greek glōssa, language, tongue.
From iso- + gloss, ultimately from Ancient Greek ἴσος (isos, “equal”) and γλῶσσα (glōssa, “tongue”).