Roundedness in the context of "Open-mid back rounded vowel"

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 phonetics and phonology, relative articulation is description of the manner and place of articulation of a speech sound relative to some reference point. Typically, the comparison is made with a default, unmarked articulation of the same phoneme in a neutral sound environment. For example, the English velar consonant /k/ is fronted before the vowel /iː/ (as in keep) compared to articulation of /k/ before other vowels (as in cool). This fronting is called palatalization.

The relative position of a sound may be described as advanced (fronted), retracted (backed), raised, lowered, centralized, or mid-centralized. The latter two terms are only used with vowels, and are marked in the International Phonetic Alphabet with diacritics over the vowel letter. The others are used with both consonants and vowels, and are marked with iconic diacritics under the letter. Another dimension of relative articulation that has IPA diacritics is the degree of roundedness, more rounded and less rounded.

The close back rounded vowel, or high back rounded vowel, is a type of vowel sound used in many spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨u⟩.

In most languages, this rounded vowel is pronounced with protruded lips ('endolabial'). However, in a few cases the lips are compressed ('exolabial').

The pronunciation of the digraph ⟨wh⟩ in English has changed over time, and still varies today between different regions and accents. It is now most commonly pronounced /w/, the same as a plain initial ⟨w⟩, although some dialects, particularly those of Scotland, Ireland, and the Southern United States, retain the traditional pronunciation /hw/, generally realized as [ʍ], a voiceless "w" sound. The process by which the historical /hw/ has become /w/ in most modern varieties of English is called the wine–whine merger. It is also referred to as glide cluster reduction.

Before rounded vowels, a different reduction process took place in Middle English, as a result of which the ⟨wh⟩ in words like who and whom is now pronounced /h/. (A similar sound change occurred earlier in the word how.)

The open back unrounded vowel, or low back unrounded vowel, is a type of vowel sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ɑ⟩. The letter ⟨ɑ⟩ is called script a or handwritten a because it lacks the extra hook on top of a printed letter a, which corresponds to a different vowel, the open front unrounded vowel. Script a, which has a full length linear stroke on its right, should not be confused with turned script a, ⟨ɒ⟩, which has the linear stroke on its left and corresponds to a rounded version of this vowel, the open back rounded vowel.

The open back unrounded vowel is the vocalic equivalent of the pharyngeal approximant [ʕ̞].

Back vowels are a class of vowel sound used in spoken languages that are produced when the tongue is positioned toward the back of the mouth. Back vowels appear in most of the world's languages, with [u] and [o] being present in 88% and 60% of languages according to PHOIBLE.

Back vowels are typically rounded, meaning that the lips are engaged while speakers are producing them, but can be unrounded as well. This is because languages want to maximize the degree of contrast between vowels. Rounding has the effect of bringing a vowel further back in the mouth, so across the world's languages, it's more common for back vowels to be rounded than unrounded, and for front vowels to be unrounded rather than rounded. This is reflected in the position of unrounded back vowels on the IPA vowel chart. They are written to the left of the unrounded front vowels to note that they are typically centralized.

A front rounded vowel is a particular type of vowel that is both front and rounded.

The front rounded vowels defined by the IPA include: