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( Labialization)
Labialisation is a secondary articulatory feature of sounds in some languages. Labialized sounds involve the lips while the remainder of the oral cavity produces another sound. The term is normally used to refer to consonants. When vowels involve the lips, they are usually called rounded. Labialisation may also refer to a type of assimilation process. Labialisation is the most widespread secondary articulation in the world's languages. It is phonemically contrastive in the Northwest Caucasian, Athabaskan, Salishan, and Indo-European language families, among others. The most common form of labialisation is rounding of dorsal consonants such as k, g, and q. With non-dorsal consonants, labialisation may also velarisation as well. Labialisation is not restricted to lip-rounding. The following articulations have either been described as labialisation, or been found as allophonic realisations of prototypical labialisation
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