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 geographic boundary line delimiting the area in which a given linguistic feature occurs.
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
- iso– Greek glōssa language, tongue
From American Heritage Dictionary of the English Language, 5th Edition
- From iso- + gloss, ultimately from Ancient Greek ἴσος (isos, “equal”) and γλῶσσα (glōssa, “tongue”).