A line on a dialect map marking the boundary between linguistic features.
- ‘All words belonging to the same isogloss must have sound correspondences and clear similarities in form and meaning.’
- ‘Although isoglosses are displayed as lines, they are actually transition areas where pronunciation gradually changes.’
- ‘Such boundaries are called isoglosses and are themselves subjected to various shades of definition.’
- ‘The following map, for example, shows several isoglosses for different grammatical features of Anishinaabemowin.’
- ‘However, the conclusion maps used in the research are not synthetic but they are drawn up using isoglosses to present the findings.’
Early 20th century: from iso- equal + Greek glōssa tongue, word.