# Sound Change **Domain:** Linguistics / Historical Phonology **Doc Type:** Concept Node **Maturity:** Developed ## Definition **Sound change** is the gradual, patterned transformation of a language's pronunciation over time. Because speakers shift sounds across a whole language at once, related words drift apart in sound while keeping regular correspondences, which lets linguists reconstruct their common ancestors. The nineteenth-century Neogrammarians held that sound laws operate without exceptions, and much of comparative linguistics rests on that regularity. Major examples include [[wiki/Grimm's Law|Grimm's Law]], which reshaped Germanic consonants, and the English [[wiki/Great Vowel Shift|Great Vowel Shift]]. ## Corpus Context Regular sound change is why phonetic hunting works: words that sound unrelated today can be traced back along predictable paths to a shared root. See [[wiki/Phonetic Etymology|Phonetic Etymology]]. ## Relationships - **Major laws:** [[wiki/Grimm's Law|Grimm's Law]] · [[wiki/Great Vowel Shift|Great Vowel Shift]]. - **Vowel patterns:** [[wiki/Ablaut|Ablaut]] · [[wiki/Umlaut|Umlaut]]. - **Reconstruction target:** [[wiki/Proto-Indo-European|Proto-Indo-European]]. - **Practice:** [[wiki/Phonetic Etymology|Phonetic Etymology]]. - **Corpus project:** [[projects/Ten Years Building a Symbolic Language Engine|Ten Years Building a Symbolic Language Engine]], Bryant McGill's symbolic language engine, built from 1994 into the mid-2000s, with its phonological engine, sound indexes, and lexical knowledge graph. ## Sources - Lyle Campbell, *Historical Linguistics: An Introduction*, 3rd ed. (MIT Press, 2013). ## See Also [[wiki/Etymology|Etymology]] · [[wiki/Phonetics|Phonetics]]