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Grimm's Law
Grimm's law (also known as the First Germanic Sound Shift) is a set of sound laws describing the Proto-Indo-European (PIE) stop consonants as they developed in Proto-Germanic in the 1st millennium BC. First systematically put forward by Jacob Grimm but previously remarked upon by Rasmus Rask, it establishes a set of regular correspondences between early Germanic stops and fricatives and stop consonants of certain other centum Indo-European languages. History Grimm's law was the first discovery of a systematic sound change, and it led to the creation of historical phonology as a separate discipline of historical linguistics. The correspondence between Latin ''p'' and Germanic ''f'' was first noted by Friedrich von Schlegel in 1806. In 1818, Rasmus Rask extended the correspondences to other Indo-European languages such as Sanskrit and Greek, and to the full range of consonants involved. In 1822, Jacob Grimm put forth the rule in his book ''Deutsche Grammatik'' and extended it to in ...
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Sound Laws
A sound change, in historical linguistics, 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. A sound change can eliminate the affected sound, or a new sound can be added. Sound changes can be environmentally conditioned if the change occurs in only some sound environments, and not others. The term "sound change" refers to diachronic changes, which occur in a language's sound system. On the other hand, " alternation" refers to changes that happen synchronically (within the language of an individual speaker, depending on the neighbouring sounds) and do not change the language's underlying system (for example, the ''-s'' in the English plural can be pronounced differently depending on ...
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Voicelessness
In linguistics, voicelessness is the property of sounds being pronounced without the larynx vibrating. Phonologically, it is a type of phonation, which contrasts with other states of the larynx, but some object that the word phonation implies voicing and that voicelessness is the lack of phonation. The International Phonetic Alphabet has distinct letters for many voiceless and modally voiced pairs of consonants (the obstruents), such as . Also, there are diacritics for voicelessness, and , which is used for letters with a descender. Diacritics are typically used with letters for prototypically voiced sounds, such as vowels and sonorant consonants: . In Russian use of the IPA, the voicing diacritic may be turned for voicelessness, e.g. . Voiceless vowels and other sonorants Sonorants are sounds such as vowels and nasals that are voiced in most of the world's languages. However, in some languages sonorants may be voiceless, usually allophonically. For example, the Japanese w ...
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Boukólos Rule
The boukólos rule is a phonological rule of the Proto-Indo-European language (PIE). It states that a labiovelar stop () dissimilates to an ordinary velar stop () next to the vowel or its corresponding glide . The rule is named after an example, the Ancient Greek word (; from Mycenaean Greek ''qo-u-ko-ro'' /gʷou̯kolos/) "cowherd", ultimately from PIE , dissimilated from . If the labiovelar had not undergone dissimilation, the word should have turned out as *, as in the analogously constructed () "goatherd" < . The same dissimilated form is the ancestor of , the source of Welsh (which would have had ''-b-'' rather than ''-g-'' if it had come from a form with *''-kʷ-'') and

Surface Filter
{{Unreferenced, date=May 2011 In linguistics, a surface filter is a type of sound change that operates not at a particular point in time but over a longer period. Surface filters normally affect any phonetic combination that is not permitted according to the language's phonetic rules and so preserve the phonotactics of that language. They are also often a source of complementary distribution between certain sets of sounds. A trivial example of a surface filter is the replacement of sounds foreign to a language with sounds native to the language. For example, a language that has no front rounded vowels may replace such vowels with either front unrounded or back rounded vowels, whenever it borrows a word containing such a vowel. Strictly speaking, that is not a surface filter, as it is merely the way in which the phonetics of one language are matched to that of another. That example, however, still illustrates the importance of surface filters in preserving the phonological structure ...
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West Germanic Languages
The West Germanic languages constitute the largest of the three branches of the Germanic languages, Germanic family of languages (the others being the North Germanic languages, North Germanic and the extinct East Germanic languages, East Germanic languages). The West Germanic branch is classically subdivided into three branches: Ingvaeonic, which includes English language, English and Frisian languages, Frisian, Istvaeonic, which includes Dutch language, Dutch and its close relatives, and Irminonic, which includes German language, German and its close relatives and variants. English language, English is by far the most-spoken West Germanic language, with more than 1 billion speakers worldwide. Within Europe, the three most prevalent West Germanic languages are English, German language, German, and Dutch language, Dutch. Frisian languages, Frisian, spoken by about 450,000 people, constitutes a fourth distinct variety of West Germanic. The language family also includes Afrikaans, Yi ...
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Proto-Italic
The Proto-Italic language is the ancestor of the Italic languages, most notably Latin and its descendants, the Romance languages. It is not directly attested in writing, but has been reconstructed to some degree through the comparative method. Proto-Italic descended from the earlier Proto-Indo-European language. History Although an equation between archeological and linguistic evidence cannot be established with certainty, the Proto-Italic language is generally associated with the Terramare (1700–1150 BC) and Villanovan cultures (900–700 BC). On the other hand, work in glottochronology has argued that Proto-Italic split off from the western Proto-Indo-European dialects some time before 2500 BC. It was originally spoken by Italic tribes north of the Alps before they moved south into the Italian Peninsula during the second half of the 2nd millennium BC. Linguistic evidence also points to early contacts with Celtic tribes and Proto-Germanic speakers. Phonology Consonants ...
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Ejective
In phonetics, ejective consonants are usually voiceless consonants that are pronounced with a glottalic egressive airstream. In the phonology of a particular language, ejectives may contrast with aspirated, voiced and tenuis consonants. Some languages have glottalized sonorants with creaky voice that pattern with ejectives phonologically, and other languages have ejectives that pattern with implosives, which has led to phonologists positing a phonological class of glottalic consonants, which includes ejectives. Description In producing an ejective, the stylohyoid muscle and digastric muscle contract, causing the hyoid bone and the connected glottis to raise, and the forward articulation (at the velum in the case of ) is held, raising air pressure greatly in the mouth so when the oral articulators separate, there is a dramatic burst of air. The Adam's apple may be seen moving when the sound is pronounced. In the languages in which they are more obvious, ejectives are often de ...
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