11. It is labialization of a vowel. 12. The most frequently encountered are labialization ( as with ), " emphatic " consonant ). 13. Is also formed with this internal rounding instead of true labialization , making it akin to. 14. Before the rounded, is phonetically strongly labialized as; elsewhere, it lacks the labialization . 15. Out of 706 language inventories surveyed by, labialization occurred most often with allophonic realizations of prototypical labialization: 16. Out of 706 language inventories surveyed by, labialization occurred most often with allophonic realizations of prototypical labialization : 17. Though I might speculate that labialization enhances the ( already existing ) acoustic differences between alveolar and postalveolar sibilants. 18. For example, in the Hupa, voiceless velar fricatives distinguish three degrees of labialization , transcribed either or. 19. Similarly, a deleted may prompt labialization of a preceding consonant, though this has ceased to carry any morphological meaning. 20. Unlike in languages such as Chishona and Tshivenda, Sesotho labialization does not result in " whistling " of any consonants.