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Approximants are speech sounds that involve the articulators approaching each other but not narrowly enough nor with enough articulatory precision to create turbulent airflow. Therefore, approximants fall between fricatives, which do produce a turbulent airstream, and vowels, which produce no turbulence. This class is composed of sounds like (as in rest) and semivowels like and (as in yes and west, respectively), as well as lateral approximants like (as in less).

Terminology

Before Peter Ladefoged coined the term approximant in the 1960s, the terms frictionless continuant and semivowel were used to refer to non-lateral approximants.

In phonology, approximant is also a distinctive feature that encompasses all sonorants except nasals, including vowels, taps, and trills.

Semivowels

Some approximants resemble vowels in acoustic and articulatory properties and the terms semivowel and glide are often used for these non-syllabic vowel-like segments. The correlation between semivowels and vowels is strong enough that cross-language differences between semivowels correspond with the differences between their related vowels.

Vowels and their corresponding semivowels alternate in many languages depending on the phonological environment, or for grammatical reasons, as is the case with Indo-European ablaut. Similarly, languages often avoid configurations where a semivowel precedes its corresponding vowel. A number of phoneticians distinguish between semivowels and approximants by their location in a syllable. Although he uses the terms interchangeably, Montreuil (2004:104) remarks that, for example, the final glides of English par and buy differ from French par ('through') and baille ('tub') in that, in the latter pair, the approximants appear in the syllable coda, whereas, in the former, they appear in the syllable nucleus. This means that opaque (if not minimal) contrasts can occur in languages like Italian (with the i-like sound of piede 'foot', appearing in the nucleus: , and that of piano 'plan', appearing in the syllable onset: ) and Spanish (with a near minimal pair being abyecto 'abject' and abierto 'opened').

Approximant-vowel correspondences

Vowel	Corresponding approximant	Place of articulation	Example
i	j**	Palatal	Spanish amplío ('I extend') vs. amplió ('he extended')
y	ɥ	Labialized palatal	French aigu ('sharp') vs. aiguille ('needle')
ɯ	ɰ**	Velar	Korean 음식 ('food') vs. 의사 ('doctor')
u	w	Labialized velar	Spanish continúo ('I continue') vs. continuó ('he/she/it continued') and ('you continued') used only in the formal treatment of 'usted'.
ɑ	ʕ̞	Pharyngeal
ɚ	ɻ	Postalveolar, retroflex	North American English waiter vs. waitress

^* Because of the articulatory complexities of the American English rhotic, there is some variation in its phonetic description. A transcription with the IPA character for an alveolar approximant () is common, though the sound is more postalveolar. Actual retroflexion may occur as well and both occur as variations of the same sound. However, Catford (1988:161f) makes a distinction between the vowels of American English (which he calls "rhotacized") and vowels with "retroflexion" such as those that appear in Badaga; Trask (1996:310), on the other hand, labels both as r-colored and notes that both have a lowered third formant.

^** Because the vowels are articulated with spread lips, spreading is implied for their approximant analogues, . However, these sounds generally have little or no lip-spreading. The fricative letters with a lowering diacritic, ⟨ʝ˕ ɣ˕⟩, may therefore be justified for a neutral articulation between spread and rounded .

In articulation and often diachronically, palatal approximants correspond to front vowels, velar approximants to back vowels, and labialized approximants to rounded vowels. In American English, the rhotic approximant corresponds to the rhotic vowel. This can create alternations (as shown in the above table).

In addition to alternations, glides can be inserted to the left or the right of their corresponding vowels when they occur next to a hiatus. For example, in Ukrainian, medial /i/ triggers the formation of an inserted that acts as a syllable onset so that when the affix /-ist/ is added to футбол ('football') to make футболіст 'football player', it is pronounced , but маоїст ('Maoist'), with the same affix, is pronounced with a glide. Dutch for many speakers has a similar process that extends to mid vowels:

• bioscoop → ('cinema')
• zee + en → ('seas')
• fluor → ('fluorine')
• reu + en → ('male dogs')
• Rwanda → ('Rwanda')
• Boaz → ('Boaz')

Similarly, vowels can be inserted next to their corresponding glide in certain phonetic environments. Sievers' law describes this behaviour for Germanic.

Non-high semivowels also occur. In colloquial Nepali speech, a process of glide-formation occurs, where one of two adjacent vowels becomes non-syllabic; the process includes mid vowels so that ('cause to wish') features a non-syllabic mid vowel. Spanish features a similar process and even nonsyllabic /a/ can occur so that ahorita ('right away') is pronounced . It is not often clear, however, whether such sequences involve a semivowel (a consonant) or a diphthong (a vowel), and in many cases, it may not be a meaningful distinction.

Although many languages have central vowels , which lie between back/velar and front/palatal , there are few cases of a corresponding approximant . One is in the Korean diphthong or though it is more frequently analyzed as velar (as in the table above), and Mapudungun may be another, with three high vowel sounds, /i/, /u/, /ɨ/ and three corresponding consonants, /j/, and /w/, and a third one is often described as a non-labialized voiced velar fricative; some texts note a correspondence between this approximant and /ɨ/ that is parallel to /j/–/i/ and /w/–/u/. An example is liq /ˈliɣ/ (?) ('white'). It has been noted that the expected symbols for the approximant correlates of , are ⟨ɉ, ɥ̶⟩ or ⟨ɉ, w̶⟩.

Approximants versus fricatives

In addition to less turbulence, approximants also differ from fricatives in the precision required to produce them. When emphasized, approximants may be slightly fricated (that is, the airstream may become slightly turbulent), which is reminiscent of fricatives. For example, the Spanish word ayuda ('help') features a palatal approximant that is pronounced as a fricative in emphatic speech. Spanish can be analyzed as having a meaningful distinction between fricative, approximant, and intermediate /ʝ ʝ˕ j/. However, such frication is generally slight and intermittent, unlike the strong turbulence of fricative consonants.

For places of articulation further back in the mouth, languages do not contrast voiced fricatives and approximants. Therefore, the IPA allows the symbols for the voiced fricatives to double for the approximants, with or without a lowering diacritic.

Occasionally, the glottal "fricatives" are called approximants, since typically has no more frication than voiceless approximants, but they are often phonations of the glottis without any accompanying manner or place of articulation.

Central approximants

Approximants with a dedicated IPA symbol are in bold.

• bilabial approximant (usually transcribed ⟨β⟩)
• labiodental approximant
• linguolabial approximant (usually transcribed ⟨ð̼⟩)
• dental approximant (usually transcribed ⟨ð⟩)
• alveolar & post-alveolar approximant
• retroflex approximant (a consonantal [ɚ])
• alveolo-palatal approximant or
• palatal approximant (a consonantal [i])
• velar approximant (a consonantal [ɯ])
• uvular approximant (usually transcribed ⟨ʁ⟩)
• pharyngeal approximant (a consonantal [ɑ]; usually transcribed ⟨ʕ⟩)
• epiglottal approximant (usually transcribed ⟨ʢ⟩)
• breathy-voiced glottal approximant
• creaky-voiced glottal approximant

Lateral approximants

In lateral approximants, the center of tongue makes solid contact with the roof of the mouth. However, the defining location is the side of the tongue, which only approaches the teeth, allowing free passage of air.

• voiced alveolar lateral approximant
• retroflex lateral approximant
• alveolo-palatal lateral approximant or (usually transcribed ⟨ȴ⟩)
• voiced palatal lateral approximant
• velar lateral approximant
• uvular lateral approximant

Coarticulated approximants

• Labialized retroflex approximant
• labialized palatal approximant (a consonantal [y])
• labialized velar approximant (a consonantal [u])
• labialized uvular approximant

Voiceless approximants

Voiceless approximants are not recognized by all phoneticians as a discrete phonetic category. There are problems in distinguishing voiceless approximants from voiceless fricatives.

Phonetic characteristics

Fricative consonants are generally said to be the result of turbulent airflow at a place of articulation in the vocal tract. However, an audible voiceless sound may be made without this turbulent airflow: Pike (1943) makes a distinction between "local friction" (as in or ) and "cavity friction" (as in voiceless vowels like and ). More recent research distinguishes between "turbulent" and "laminar" airflow in the vocal tract. It is not clear if it is possible to describe voiceless approximants categorically as having laminar airflow (or cavity friction in Pike's terms) as a way of distinguishing them from fricatives. Ball & Rahilly (1999) write that "the airflow for voiced approximants remains laminar (smooth), and does not become turbulent. Voiceless approximants are rare in the languages of the world, but when they do occur the airflow is usually somewhat turbulent." Audible voiceless sounds may also be produced by means of turbulent airflow at the glottis, as in ; in such a case, it is possible to articulate an audible voiceless sound without the production of local friction at a supraglottal constriction. Catford (1977) describes such sounds, but classes them as sonorants.

Distinctiveness

Voiceless approximants are rarely if ever distinguished phonemically from voiceless fricatives in the sound system of a language. Clark & Yallop (1995) discuss the issue and conclude "In practice, it is difficult to distinguish between a voiceless approximant and a voiceless fricative at the same place of articulation ... there is no evidence that any language in the world makes such a distinction crucial."

Disagreement over use of the term

Voiceless approximants are treated as a phonetic category by (among others) Ladefoged & Maddieson (1996), Catford (1977), and Bickford & Floyd (2006). However, the term voiceless approximant is seen by some phoneticians as controversial. It has been pointed out that if approximant is defined as a speech sound that involves the articulators approaching each other but not narrowly enough to create turbulent airflow, then it is difficult to see how a voiceless approximant could be audible. As John C. Wells puts it in his blog, "voiceless approximants are by definition inaudible ... If there's no friction and no voicing, there's nothing to hear." A similar point is made in relation to frictionless continuants by O'Connor (1973): "There are no voiceless frictionless continuants because this would imply silence; the voiceless counterpart of the frictionless continuant is the voiceless fricative." Ohala & Solé (2010) argue that the increased airflow arising from voicelessness alone makes a voiceless continuant a fricative, even if lacking a greater constriction in the oral cavity than a voiced approximant.

Ladefoged & Maddieson (1996) argue that Burmese and Standard Tibetan have voiceless lateral approximants and Navajo and Zulu voiceless lateral fricatives [ɬ], but also say that "in other cases it is difficult to decide whether a voiceless lateral should be described as an approximant or a fricative". Asu, Nolan & Schötz (2015) compared voiceless laterals in Estonian Swedish, Icelandic, and Welsh and found that Welsh-speakers consistently used , that Icelandic-speakers consistently used , and that speakers of Estonian Swedish varied in their pronunciation. They conclude that there is "a range of variants within voiceless laterals, rather than a categorical split between lateral fricatives and voiceless approximant laterals".

Occurrence in Western American English

Voiceless lateral approximants can occur after voiceless stops as allophone of its voiced counterpart, especially after the voiceless velar plosive /k/, in Western American English.

Nasalized approximants

Examples are:

• nasal palatal approximant
• nasal labialized velar approximant
• voiceless nasal glottal approximant

In Portuguese, the nasal glides and historically became /ɲ/ and /m/ in some words. In Edo, the nasalized allophones of the approximants /j/ and /w/ are nasal occlusives, and .

What are transcribed as nasal approximants may include non-syllabic elements of nasal vowels or diphthongs.

See also

• Liquid consonant
• List of phonetics topics
• Semivowel

Notes

1. Ladefoged (1975:277)
2. Martínez-Celdrán (2004:201), citing Ladefoged & Maddieson (1996)
3. Martínez-Celdrán (2004:201)
4. Martínez-Celdrán (2004:201)
5. Martínez-Celdrán (2004:201), pointing to Ladefoged (1964:25)
6. Hall (2007:316)
7. Ladefoged & Maddieson (1996:323), citing Maddieson & Emmorey (1985)
8. Rubach (2002:680), citing Kawasaki (1982)
9. Montreuil (2004:104)
10. Saporta (1956:288)
11. Martínez-Celdrán (2004:202)
12. Ladefoged & Maddieson (1996:323)
13. Hallé et al. (1999:283) citing Delattre & Freeman (1968), Zawadzki & Kuehn (1980), and Boyce & Espy-Wilson (1997)
14. Both cited in Hamann (2003:25–26)
15. John Esling (2010) "Phonetic Notation", in Hardcastle, Laver & Gibbon (eds) The Handbook of Phonetic Sciences, 2nd ed., p. 699
16. Rubach (2002:672)
17. Rubach (2002:675–676)
18. Rubach (2002:677–678)
19. ^ There is dialectal and allophonic variation in the realization of /ʋ/. For speakers who realize it as , Rubach (2002:683) postulates an additional rule that changes any occurrence of from glide insertion into .
20. Ladefoged & Maddieson (1996:323–324)
21. Martínez-Celdrán, Fernández-Planas & Carrera-Sabaté (2003:256–257)
22. "Ahn & Iverson (2006)" (PDF), archived from the original (PDF) on 2011-07-20, retrieved 2010-12-31
23. Listen to a recording Archived February 26, 2006, at the Wayback Machine
24. Martin Ball & Joan Rahilly (2011) The symbolization of central approximants in the IPA. Journal of the International Phonetic Association. 41 (2), pp. 231–237
25. Ball, Martin J.; Müller, Nicole (2011), Phonetics for communication disorders, Psychology Press, p. 70, ISBN 978-0-8058-5363-6
26. Boersma (1997:12)
27. Martínez-Celdrán (2004:204)
28. Martínez-Celdrán, E. (2004) "Problems in the classification of approximants". Journal of the International Phonetic Association, 34, 201–10
29. ^ There have been repeated requests that the IPA created dedicated symbols for and – typically modifications of the base letters such as turned ⟨_β⟩ and ⟨_ð⟩ or reversed ⟨β⟩ and ⟨ð⟩ – but so far the IPA has deemed that there is insufficient need for them.
30. Ashby & Maidment (2005:56–7)
31. Pike (1943:71, 138–9)
32. Shadle (2000:37–8)
33. Ball & Rahilly (1999:50–1)
34. Catford (1977:122–3)
35. Clark & Yallop (1995:48)
36. Akamatsu (1992:30)
37. Wells, J. C. (7 April 2009), "[h]: Fricative or approximant?", John Wells' Blog, retrieved 23 December 2020
38. O'Connor (1973:61)
39. Ohala & Solé (2010:43)
40. Ladefoged & Maddieson (1996:198–9)
41. Asu, Nolan & Schötz (2015:5)
42. Grønnum (2005:154)

References

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• Hamann, Silke (2003), The Phonetics and Phonology of Retroflexes, Utrecht: LOT, ISBN 90-76864-39-X
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v t e International Phonetic Alphabet (chart)
IPA topics IPA International Phonetic Association History of the alphabet Extensions for disordered speech (extIPA) Voice Quality Symbols (VoQS) Journal of the IPA (JIPA) Special topics Cursive forms Case variants Obsolete and nonstandard symbols Naming conventions Sinological extensions World Orthography IPA chart for English dialects Encodings ASCII encodings SAMPA X-SAMPA Kirshenbaum TIPA Phonetic symbols in Unicode IPA number IPA Braille
Consonants Pulmonic consonants Place → Labial Coronal Dorsal Laryngeal Manner ↓ Bi­labial Labio­dental Linguo­labial Dental Alveolar Post­alveolar Retro­flex Palatal Velar Uvular Pharyn­geal/epi­glottal Glottal Nasal m̥ m ɱ̊ ɱ n̼ n̥ n ɳ̊ ɳ ɲ̊ ɲ ŋ̊ ŋ ɴ̥ ɴ Plosive p b p̪ b̪ t̼ d̼ t d ʈ ɖ c ɟ k ɡ q ɢ ʡ ʔ Sibilant affricate ts dz t̠ʃ d̠ʒ tʂ dʐ tɕ dʑ Non-sibilant affricate pɸ bβ p̪f b̪v t̪θ d̪ð tɹ̝̊ dɹ̝ t̠ɹ̠̊˔ d̠ɹ̠˔ cç ɟʝ kx ɡɣ qχ ɢʁ ʡʜ ʡʢ ʔh Sibilant fricative s z ʃ ʒ ʂ ʐ ɕ ʑ Non-sibilant fricative ɸ β f v θ̼ ð̼ θ ð θ̠ ð̠ ɹ̠̊˔ ɹ̠˔ ɻ̊˔ ɻ˔ ç ʝ x ɣ χ ʁ ħ ʕ h ɦ Approximant ʋ ɹ ɻ j ɰ ʔ̞ Tap/flap ⱱ̟ ⱱ ɾ̼ ɾ̥ ɾ ɽ̊ ɽ ɢ̆ ʡ̆ Trill ʙ̥ ʙ r̥ r ɽ̊r̥ ɽr ʀ̥ ʀ ʜ ʢ Lateral affricate tɬ dɮ tꞎ d𝼅 c𝼆 ɟʎ̝ k𝼄 ɡʟ̝ Lateral fricative ɬ ɮ ꞎ 𝼅 𝼆 ʎ̝ 𝼄 ʟ̝ Lateral approximant l ɭ ʎ ʟ ʟ̠ Lateral tap/flap ɺ̥ ɺ 𝼈̥ 𝼈 ʎ̆ ʟ̆ IPA help  audio full chart template Symbols to the right in a cell are voiced, to the left are voiceless. Shaded areas denote articulations judged impossible. Non-pulmonic consonants BL LD D A PA RF P V U EG Ejective Stop pʼ tʼ ʈʼ cʼ kʼ qʼ ʡʼ Affricate p̪fʼ t̪θʼ tsʼ t̠ʃʼ tʂʼ tɕʼ kxʼ qχʼ Fricative ɸʼ fʼ θʼ sʼ ʃʼ ʂʼ ɕʼ xʼ χʼ Lateral affricate tɬʼ c𝼆ʼ k𝼄ʼ q𝼄ʼ Lateral fricative ɬʼ Click (top: velar; bottom: uvular) Tenuis kʘ qʘ kǀ qǀ kǃ qǃ k𝼊 q𝼊 kǂ qǂ Voiced ɡʘ ɢʘ ɡǀ ɢǀ ɡǃ ɢǃ ɡ𝼊 ɢ𝼊 ɡǂ ɢǂ Nasal ŋʘ ɴʘ ŋǀ ɴǀ ŋǃ ɴǃ ŋ𝼊 ɴ𝼊 ŋǂ ɴǂ ʞ   Tenuis lateral kǁ qǁ Voiced lateral ɡǁ ɢǁ Nasal lateral ŋǁ ɴǁ Implosive Voiced ɓ ɗ ᶑ ʄ ɠ ʛ Voiceless ɓ̥ ɗ̥ ᶑ̊ ʄ̊ ɠ̊ ʛ̥ IPA help  audio full chart template Co-articulated consonants Nasal n͡m Labial–alveolar ɳ͡m Labial–retroflex ŋ͡m Labial–velar Plosive t͡pd͡b Labial–alveolar ʈ͡pɖ͡b Labial–retroflex k͡pɡ͡b Labial–velar q͡ʡ Uvular–epiglottal q͡p Labial–uvular Fricative/approximant ɥ̊ɥ Labial–palatal ʍw Labial–velar ɧ Sj-sound (variable) Lateral approximant ɫ Velarized alveolar Implosive ɠ̊͜ɓ̥ ɠ͡ɓ Labial–velar Ejective t͡pʼ Labial–alveolar IPA help full chart template Other Nasal labial–velar approximant Nasal palatal approximant Voiceless bidental fricative Voiceless bilabially post-trilled dental stop Voiceless nasal glottal approximant
Vowels Front Central Back Close i y ɨ ʉ ɯ u Near-close ɪ ʏ ʊ Close-mid e ø ɘ ɵ ɤ o Mid e̞ ø̞ ə ɤ̞ o̞ Open-mid ɛ œ ɜ ɞ ʌ ɔ Near-open æ ɐ Open a ɶ ä ɑ ɒ IPA help  audio full chart template Legend: unrounded • rounded

• Manner of articulation
• Approximant consonants