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isogloss

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English

Etymology

From iso- + gloss, ultimately from Ancient Greek ἴσος (ísos, equal) (possibly from Proto-Indo-European *wi- (to separate)) + γλῶσσα (glôssa, tongue; language) (ultimately from Proto-Indo-European *glōgʰs).

Pronunciation

Noun

isogloss (plural isoglosses)

  1. (linguistics) A line on a map indicating the geographical boundaries of a linguistic feature.
    Synonym: heterogloss
    • 1921, The Calcutta Review, Calcutta: University of Calcutta, →OCLC, page 285:
      Bloch thinks (and we agree with him) that details of isogloss will probably not bear out this kind of grouping.
    • 2005, Brian D. Joseph, Carol G. Preston, Dennis R. Preston, editors, Language Diversity in Michigan and Ohio: Towards Two State Linguistic Profiles, Ann Arbor, Mich.: Caravan Books, →ISBN, page 29:
      The convergence of multiple isoglosses on a map, a "bundle", indicates a boundary between one regional dialect and another.
  2. (linguistics) A linguistic feature shared between languages or language varieties, through any of various mechanisms, whether genetic inheritance or other linguistic forces.
    • 1970, W[illiam] F[oxwell] Albright, T[homas] O[den] Lambdin, “The Evidence of Language”, in I[orwerth] E[iddon] S[tephen] Edwards, C[yril] J[ohn] Gadd, N[icholas] G[eoffrey] L[emprière] Hammond, editors, The Cambridge Ancient History, 3rd edition, volumes I, part 1 (Prolegomena and Prehistory), Cambridge: Cambridge University Press, published 2000, →ISBN, section IV (Sumerian, Hurrian, Urarṭian, Elamite), page 154:
      There was also a tendency to treat transitive verbs passively, as in Hurrian and Urarṭian; it must, however, be emphasized that this phenomenon may also be considered as an isogloss rather than as an indication of genetic relationship.
    • 2025, Cid Swanenvleugel, The Pre-Roman Elements of the Sardinian Lexicon, page 66:
      It is likely that the Sardinian forms are related to Lat. afrissa 'dragon lily'. The question regarding its etymology is all but resolved however. It is not quite clear where Pseudo-Apuleius' herbarium [the only known use of afrissa] was composed. If it is North African, as has been proposed, this might be yet another instance of a Sardinian-African Romance isogloss, possibly due to Punic influence.

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