Consonant

In articulatory phonetics, a consonant is a sound in spoken language that is characterized by a closure or stricture of the vocal tract sufficient to cause audible turbulence. The word consonant comes from Latin and means "sounding with" or "sounding together," the idea being that consonants don't sound on their own, but occur only with a nearby vowel, which is the case in Latin. This conception of consonants, however, does not reflect the modern linguistic understanding which defines consonants in terms of vocal tract constriction.

Since the number of consonants in the world's languages is much greater than the number of consonant letters in any one alphabet, linguists have devised systems such as the International Phonetic Alphabet (IPA) to assign a unique symbol to each possible consonant. In fact, the Latin alphabet, which is used to write English, has fewer consonant letters than English has consonant sounds, so some letters represent more than one consonant, and digraphs like "sh" and "th" are used to represent some sounds. Many speakers aren't even aware that the "th" sound in "this" is a different sound from the "th" sound in "thing" (in the IPA they're [ð] and [θ], respectively).

Each consonant can be distinguished by several features:

The manner of articulation is the method that the consonant is articulated, such as nasal (through the nose), stop (complete obstruction of air), or approximant (vowel like). The place of articulation is where in the vocal tract the obstruction of the consonant occurs, and which speech organs are involved. Places include bilabial (both lips), alveolar (tongue against the gum ridge), and velar (tongue against soft palate). Additionally, there may be a simultaneous narrowing at another place of articulation, such as palatalisation or pharyngealisation. The phonation of a consonant is how the vocal cords vibrate during the articulation. When the vocal cords vibrate fully, the consonant is called voiced; when they do not vibrate at all, it's voiceless. The voice onset time (VOT) indicates the timing of the phonation. Aspiration is a feature of VOT.

The airstream mechanism is how the air moving through the vocal tract is powered. Most languages have exclusively pulmonic egressive consonants, which use the lungs and diaphragm, but ejectives, clicks, and implosives use different mechanisms. The length is how long the obstruction of a consonant lasts. This feature is borderline distinctive in English, as in "wholly" [hoʊlli] vs. "holy" [hoʊli], but cases are limited to morpheme boundaries. Unrelated roots are differentiated in various languages such as Italian, Japanese and Finnish, with two length levels, "single" and "geminate". Estonian and some Sami languages have three phonemic lengths: short, geminate, and long geminate, although the distinction between the geminate and overlong geminate includes suprasegmental features. The articulatory force is how much muscular energy is involved. This has been proposed many times, but no distinction relying exclusively on force has ever been demonstrated.

All English consonants can be classified by a combination of these features, such as "voiceless alveolar stop consonant" [t]. In this case the airstream mechanism is omitted.

Some pairs of consonants like p::b, t::d are sometimes called fortis and lenis, but this is a phonological rather than phonetic distinction.

Syllabary

Languages using syllabaries

Languages that use syllabic writing include Mycenaean Greek (Linear B), the Native American language Cherokee, the African language Vai, the English-based creole language Ndyuka (the Afaka script), Yi language in China, and the Nü Shu syllabary for Yao people, China. The Chinese, Cuneiform, and Maya scripts are largely syllabic in nature, although based on logograms. They are therefore sometimes referred to as logosyllabic. The Japanese language uses two syllabaries together called kana, namely hiragana and katakana (developed around 700 AD). They are mainly used to write some native words and grammatical elements, as well as foreign words, e.g. hotel is written with three kana, ホテル (ho-te-ru), in Japanese. Because Japanese uses a lot of CV (consonant + vowel) syllables, a syllabary is well suited to write the language. As in many syllabaries, however, vowel sequences and final consonants are written with separate glyphs, so that both atta and kaita are written with three kana: あった (a-t-ta) and かいた (ka-i-ta). It is therefore sometimes called a moraic writing system.

Difference between an abugida and a syllabary

Indian languages and Ethiopian languages have a type of alphabet called an abugida or alphasyllabary. These are sometimes mistaken for syllabaries, but unlike in syllabaries, all syllables starting with the same consonant are based on the same symbol, and generally more than one symbol is needed to represent a syllable. In the 19th century these systems were called syllabics, a term which has survived in the name of Canadian Aboriginal Syllabics (also an abugida). In a true syllabary there is no systematic graphic similarity between phonetically related characters (though some do have graphic similarity for the vowels). That is, the characters for "ke", "ka", and "ko" have no similarity to indicate their common "k"-ness (e.g. Hiragana け, か, こ). Compare abugida, where each grapheme typically represents a syllable but where characters representing related sounds are similar graphically (typically, a common consonantal base is annotated in a more or less consistent manner to represent the vowel in the syllable).

Comparison to English alphabet

The English language allows complex syllable structures, making it cumbersome to write English words with a syllabary. A "pure" syllabary would require a separate glyph for every syllable in English. Thus one would need separate symbols for "bag," "beg," "big," "bog," "bug" ; "bad," "bed," "bid," "bod," "bud," etc. However, such pure systems are rare. A work-around to this problem, common to several syllabaries around the world (including English loanwords in Japanese), is to write an echo vowel, as if the syllable coda was a second syllable: ba-ga or ba-gu for "bag", etc. Another common approach is to simply ignore the coda, so that "bag" would be written ba. This obviously would not work well for English, but was done in Mycenean Greek when the root word was two or three syllables long and the syllable coda was a weak consonant such as n or s (example: chrysos written as ku-ru-so).