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In historical linguistics, a sound change is a change in the pronunciation of a language. A sound change can involve the replacement of one speech sound (or, more generally, one phonetic feature value) by a different one (called phonetic change) or a more general change to the speech sounds that exist (phonological change), such as the merger of two sounds or the creation of a new sound.
Grimm's law was the first discovered systematic sound change, creating historical phonology as a historical linguistics discipline. Friedrich von Schlegel first noted the correspondence between Latin p and Germanic f in 1806.
As the Proto-Indo-European language (PIE) broke up, its sound system diverged as well, as evidenced in various sound laws associated with the daughter Indo-European languages. Especially notable is the palatalization that produced the satem languages, along with the associated ruki sound law. Other notable changes include:
Germanic sound shifts are the phonological developments (sound changes) from the Proto-Indo-European language (PIE) to Proto-Germanic, in Proto-Germanic itself, and in various Germanic subfamilies and languages.
On account of the above, the vowel inventory changes from /iː i eː e a aː o oː u uː/ to /i ɪ e ɛ a ɔ o ʊ u/, with pre-existing differences in vowel quality achieving phonemic status and with no distinction between original /a/ and /aː/. Additionally: Unstressed /ɛ/ and /ɔ/ merge into /e/ and /o/ respectively. [32]
The ruki sound law, also known as the ruki rule or iurk rule, is a historical sound change that took place in the satem branches of the Indo-European language family, namely in Balto-Slavic, Armenian, [1] and Indo-Iranian.
In a typological scheme first systematized by Henry M. Hoenigswald in 1965, a historical sound law can only affect a phonological system in one of three ways: . Conditioned merger (which Hoenigswald calls "primary split"), in which some instances of phoneme A become an existing phoneme B; the number of phonemes does not change, only their distribution.
Verner's law is a famous example of the Neogrammarian hypothesis, as it resolved an apparent exception to Grimm's law. The Neogrammarian hypothesis was the first hypothesis of sound change to attempt to follow the principle of falsifiability according to the scientific method.