Bilabial consonantIn phonetics, a bilabial consonant is a labial consonant articulated with both lips. Bilabial consonants are very common across languages. Only around 0.7% of the world's languages lack bilabial consonants altogether, including Tlingit, Chipewyan, Oneida, and Wichita. The bilabial consonants identified by the International Phonetic Alphabet (IPA) are: Owere Igbo has a six-way contrast among bilabial stops: [p ph ɓ̥ b b̤ ɓ]. The extensions to the IPA also define a ([ʬ]) for smacking the lips together.
AllophoneIn phonology, an allophone (ˈæləfoʊn; from the Greek ἄλλος, , 'other' and φωνή, , 'voice, sound') is one of multiple possible spoken sounds - or phones - or signs used to pronounce a single phoneme in a particular language. For example, in English, the voiceless plosive t (as in stop [ˈstɒp]) and the aspirated form th (as in top [ˈthɒp]) are allophones for the phoneme /t/, while these two are considered to be different phonemes in some languages such as Thai.
Rhotic consonantIn phonetics, rhotic consonants, or "R-like" sounds, are liquid consonants that are traditionally represented orthographically by symbols derived from the Greek letter rho, including , in the Latin script and , in the Cyrillic script. They are transcribed in the International Phonetic Alphabet by upper- or lower-case variants of Roman , : r, ɾ, ɹ, ɻ, ʀ, ʁ, ɽ, and ɺ. Transcriptions for vocalic or semivocalic realisations of underlying rhotics include the ə and ɐ.
PhoneticsPhonetics is a branch of linguistics that studies how humans produce and perceive sounds, or in the case of sign languages, the equivalent aspects of sign. Linguists who specialize in studying the physical properties of speech are phoneticians. The field of phonetics is traditionally divided into three sub-disciplines based on the research questions involved such as how humans plan and execute movements to produce speech (articulatory phonetics), how various movements affect the properties of the resulting sound (acoustic phonetics), or how humans convert sound waves to linguistic information (auditory phonetics).
Retroflex consonantA retroflex (ˈɹɛtɹoʊflɛks or ˈɹɛtɹəflɛks), apico-domal, or cacuminal (kæˈkjuːmᵻnəl) consonant is a coronal consonant where the tongue has a flat, concave, or even curled shape, and is articulated between the alveolar ridge and the hard palate. They are sometimes referred to as cerebral consonants—especially in Indology. The Latin-derived word retroflex means "bent back"; some retroflex consonants are pronounced with the tongue fully curled back so that articulation involves the underside of the tongue tip (subapical).
Velar consonantVelars are consonants articulated with the back part of the tongue (the dorsum) against the soft palate, the back part of the roof of the mouth (also known as the “velum”). Since the velar region of the roof of the mouth is relatively extensive and the movements of the dorsum are not very precise, velars easily undergo assimilation, shifting their articulation back or to the front depending on the quality of adjacent vowels.
Modal voiceModal voice is the vocal register used most frequently in speech and singing in most languages. It is also the term used in linguistics for the most common phonation of vowels. The term "modal" refers to the resonant mode of vocal folds; that is, the optimal combination of airflow and glottal tension that yields maximum vibration. In linguistics, modal voice is the only phonation found in the vowels and other sonorants (consonants such as m, n, l, and r) of most of the languages of the world, but a significant minority contrasts modal voice with other phonations.
Free variationIn linguistics, free variation is the phenomenon of two (or more) sounds or forms appearing in the same environment without a change in meaning and without being considered incorrect by native speakers. Sociolinguists argue that describing such variation as "free" is very often a misnomer, since variation between linguistic forms is usually constrained probabilistically by a range of systematic social and linguistic factors, not unconstrained as the term "free variation" suggests.
Tenuis consonantIn linguistics, a tenuis consonant (ˈtɛn.ju:ɪs or ˈtɛnu:ɪs) is an obstruent that is voiceless, unaspirated and unglottalized. In other words, it has the "plain" phonation of [p, t, ts, tʃ, k] with a voice onset time close to zero (a zero-VOT consonant), as Spanish p, t, ch, k or English p, t, k after s (spy, sty, sky). For most languages, the distinction is relevant only for stops and affricates. However, a few languages have analogous series for fricatives.
Voice onset timeIn phonetics, voice onset time (VOT) is a feature of the production of stop consonants. It is defined as the length of time that passes between the release of a stop consonant and the onset of voicing, the vibration of the vocal folds, or, according to other authors, periodicity. Some authors allow negative values to mark voicing that begins during the period of articulatory closure for the consonant and continues in the release, for those unaspirated voiced stops in which there is no voicing present at the instant of articulatory closure.
