Nasalization in the context of "Nasal vowels"

In phonology, vowel harmony is a phonological process in which vowels assimilate ("harmonize") to share certain distinctive features. Vowel harmony is often confined to the domain of a phonological word, but may extend across word boundaries in certain languages.

Generally, one vowel will trigger a shift in other vowels within the domain, such that the affected vowels match the relevant feature of the trigger vowel. Intervening segments are common between affected vowels, meaning that the vowels do not need to be next to each other for this change to apply, classifying this as a "long-distance" type of assimilation. Common phonological features that define the natural classes of vowels involved in vowel harmony include vowel backness, vowel height, nasalization, roundedness, and advanced and retracted tongue root.

In articulatory phonetics, the manner of articulation is the configuration and interaction of the articulators (speech organs such as the tongue, lips, and palate) when making a speech sound. One parameter of manner is stricture, that is, how closely the speech organs approach one another. Others include those involved in the r-like sounds (taps and trills), and the sibilancy of fricatives.

The concept of manner is mainly used in the discussion of consonants, although the movement of the articulators will also greatly alter the resonant properties of the vocal tract, thereby changing the formant structure of speech sounds that is crucial for the identification of vowels. For consonants, the place of articulation and the degree of phonation or voicing are considered separately from manner, as being independent parameters. Homorganic consonants, which have the same place of articulation, may have different manners of articulation. Often nasality and laterality are included in manner, but some phoneticians, such as Peter Ladefoged, consider them to be independent.

In phonetics, a nasal, also called a nasal occlusive or nasal stop in contrast with an oral stop or nasalized consonant, is an occlusive consonant produced with a lowered velum, allowing air to escape freely through the nose. The vast majority of consonants are oral consonants. Examples of nasals in English are [n], [ŋ] and [m], in words such as nose, bring and mouth.

Nasal occlusives are nearly universal in human languages. There are also other kinds of nasal consonants in some languages.