Editing Labialization (section)

{{short description|Secondary articulatory feature of sounds in some languages}}
{{redirect|Lip rounding|the lip rounding of vowels|Roundedness}}
{{about|labial rounding|internal rounding|sulcalization}}
{{Infobox IPA
| above = Labialized (spread lips)
| ipa symbol = ◌ᵝ
}}
{{Infobox IPA
| above = Labial(-velar)ized with protrusion (rounded lips)
| ipa symbol = ◌ʷ
}}
{{Sound change}}

'''Labialization''' is a [[Secondary articulation|secondary articulatory]] feature of sounds in some languages. Labialized sounds involve the lips while the remainder of the [[Human mouth|oral cavity]] produces another sound. The term is normally restricted to [[consonant]]s. When vowels involve the lips, they are called [[roundedness|rounded]].

The most common labialized consonants are [[Labialized velar consonant|labialized velars]]. Most other labialized sounds also have simultaneous [[velarization]], and the process may then be more precisely called '''labio-velarization'''. The "labialization" of bilabial consonants often refers to '''protrusion''' instead of a secondary articulatory feature [[velarization]]. [pʷ] doesn't mean [pˠ] although [w] refers to a [[labial–velar approximant]]. 

In [[phonology]], labialization may also refer to a type of [[Assimilation (linguistics)|assimilation]] process.