Consonant

A phoneme (/ˈfoʊniːm/) is any set of similar speech sounds that are perceptually regarded by the speakers of a language as a single basic sound—a smallest possible phonetic unit—that helps distinguish one word from another. All languages contain phonemes (or the spatial-gestural equivalent in sign languages), and all spoken languages include both consonant and vowel phonemes. Phonemes are studied under phonology, a branch of the discipline of linguistics (a field encompassing language, writing, speech and related matters).

Phonemes are often represented, when written, as a glyph (a character) enclosed within two forward-sloping slashes /. So, for example, /k/ represents the phoneme or sound used in the beginning of the English language word cat (as opposed to, say, the /b/ of bat).

A syllable is a basic unit of organization within a sequence of speech sounds, such as within a word, typically defined by linguists as a nucleus (most often a vowel) with optional sounds before or after that nucleus (margins, which are most often consonants). In phonology and studies of languages, syllables are often considered the "building blocks" of words. They can influence the rhythm of a language: its prosody or poetic metre. Properties such as stress, tone, and reduplication operate on syllables and their parts. Speech can usually be divided up into a whole number of syllables: for example, the word ignite is made of two syllables: ig and nite. Most languages of the world use relatively simple syllable structures that often alternate between vowels and consonants.

Despite being present in virtually all human languages, syllables still have no precise definition that is valid for all known languages. A common criterion for finding syllable boundaries is native-speaker intuition, but individuals sometimes disagree on them.

A fricative is a consonant produced by forcing air through a narrow channel made by placing two articulators close together. These may be the lower lip against the upper teeth, in the case of [f]; the back of the tongue against the soft palate in the case of German [x] (the final consonant of Bach); or the side of the tongue against the molars, in the case of Welsh [ɬ] (appearing twice in the name Llanelli). This turbulent airflow is called frication.

A particular subset of fricatives are the sibilants. When forming a sibilant, one still is forcing air through a narrow channel, but in addition, the tongue is curled lengthwise to direct the air over the edge of the teeth. English [s], [z], [ʃ], and [ʒ] are examples of sibilants.

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.

A pulmonic consonant is a consonant produced by air pressure from the lungs, as opposed to ejective, implosive and click consonants.

Most languages have only pulmonic consonants. Ian Maddieson, in his survey of 566 languages, found that only 152 had ejectives, implosives, or clicks (or two or three of these types) – that is, 73% of the world's extant languages have only pulmonic consonants. See glottalic consonants and click consonants for more information on the distribution of nonpulmonic consonants.

Voice or voicing is a term used in phonetics and phonology to characterize speech sounds (usually consonants). Speech sounds can be described as either voiceless (otherwise known as unvoiced) or voiced.

The term, however, is used to refer to two separate concepts:

A syllabic consonant, or vocalic consonant, is a consonant that forms the nucleus of a syllable on its own, like the m, n and l in some pronunciations of the English words rhythm, button and awful, respectively. To represent it, the understroke diacritic in the International Phonetic Alphabet is used, ⟨U+0329 ◌̩ COMBINING VERTICAL LINE BELOW⟩. It may be instead represented by an overstroke, ⟨U+030D ◌̍ COMBINING VERTICAL LINE ABOVE⟩ if the symbol that it modifies has a descender, such as in [ŋ̍].

Syllabic consonants in most languages are sonorants, such as nasals and liquids. Very few have syllabic obstruents (i.e., stops, fricatives, and affricates) in normal words, but English has syllabic fricatives in paralinguistic words like shh! and zzz.

English phonology is the system of speech sounds used in spoken English. Like many other languages, English has wide variation in pronunciation, both historically and from dialect to dialect. In general, however, the worldwide dialects of English share a largely similar (but not identical) phonological system. Among other things, most dialects have vowel reduction in unstressed syllables and a complex set of phonological features that distinguish fortis and lenis consonants (stops, affricates, and fricatives).

Phonological analysis of English often concentrates on prestige or standard accents, such as Received Pronunciation for England, General American for the United States, and General Australian for Australia. Nevertheless, many other dialects of English are spoken, which have developed differently from these standardized accents, particularly regional dialects. Descriptions of standardized reference accents provide only a limited guide to the phonology of other dialects of English.

The roots of verbs and most nouns in the Semitic languages are characterized as a sequence of consonants or "radicals" (hence the term consonantal root). Such abstract consonantal roots are used in the formation of actual words by adding the vowels and non-root consonants (or "transfixes"), which go with a particular morphological category around the root consonants, in an appropriate way, generally following specific patterns.

It is a peculiarity of Semitic linguistics that many of these consonantal roots are triliterals, meaning that they consist of three letters (although there are a number of quadriliterals, and in some languages also biliterals). Such roots are also common in other Afroasiatic languages. While Berber mostly has triconsonantal roots, Chadic, Omotic, and Cushitic have mostly biconsonantal roots; and Egyptian shows a mix of biconsonantal and triconsonantal roots.