Where Found
Labialization is the most widespread secondary articulation in the world's languages. It is phonemically contrastive in Northwest Caucasian (e.g. Adyghe), Athabaskan, and Salishan language families, among others. This contrast is reconstructed also for Proto-Indo-European, the common ancestor of the Indo-European languages.
American English has three degrees of labialization: tight rounded (/w/), slight rounded (/ʃ/, /ʒ/, /tʃ/, /dʒ/, initial /r/), and unrounded, which in vowels is sometimes called 'spread'. These secondary articulations are not universal. For example, French shares the English slight rounding of /ʃ/, /ʒ/ while Russian does not have slight rounding in its postalveolar fricatives (/ʂ ʐ ɕ ʑ/).
A few languages, including Arrernte and Mba, have contrastive labialized forms for almost all of their consonants.
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