An abugida /ˌɑːbˈɡdə/ (from Ge‘ez አቡጊዳ ’äbugida), also called an alphasyllabary, is a segmental writing system in which consonant–vowel sequences are written as a unit: each unit is based on a consonant letter, and vowel notation is secondary. This contrasts with a full alphabet, in which vowels have status equal to consonants, and with an abjad, in which vowel marking is absent or optional. (In less formal contexts, all three types of script may commonly be termed as alphabets.) Abugidas include the extensive Brahmic family of scripts of South and Southeast Asia.

Abugida as a term in linguistics was proposed by Peter T. Daniels in his 1990 typology of writing systems.[1] ’Abugida is an Ethiopian name for the Ge‘ez script, taken from four letters of that script, ’ä bu gi da, in much the same way that abecedary is derived from Latin a be ce de, and alphabet is derived from the names of the two first letters in the Greek alphabet, alpha and beta. As Daniels used the word, an abugida is in contrast with a syllabary, where letters with shared consonants or vowels show no particular resemblance to one another, and also with an alphabet proper, where independent letters are used to denote both consonants and vowels. The term alphasyllabary was suggested for the Indic scripts in 1997 by William Bright, following South Asian linguistic usage, to convey the idea that "they share features of both alphabet and syllabary".[2][3]

Abugidas were long considered to be syllabaries, or intermediate between syllabaries and alphabets, and the term syllabics is retained in the name of Canadian Aboriginal Syllabics. Other terms that have been used include neosyllabary (Février 1959), pseudo-alphabet (Householder 1959), semisyllabary (Diringer 1968; a word that has other uses) and syllabic alphabet (Coulmas 1996; this term is also a synonym for syllabary).[3]


In general, a letter of an abugida transcribes a consonant. Letters are written as a linear sequence, in most cases left to right. Vowels are written through modification of these consonantal letters, either by means of diacritics (which may not follow the direction of writing the letters), or by changes in the form of the letter itself.

Vowels not preceded by a consonant may be represented with a zero consonant letter, modified to indicate the vowel, or separate letters for each vowel, that are distinct from the corresponding dependent vowel signs. Consonants not followed by a vowel may be represented with:

  • a modification that explicitly indicates the lack of a vowel (virama),
  • a lack of vowel marking (often with ambiguity between no vowel and a default inherent vowel),
  • vowel marking for a short or neutral vowel such as schwa (with ambiguity between no vowel and that short or neutral vowel),
  • conjunct consonant letters, where two or more letters are graphically joined in a ligature, or
  • dependent consonant signs, which may be smaller or differently placed versions of the full consonant letters, or may be distinct signs altogether.

There are three principal families of abugidas, depending on whether vowels are indicated by modifying consonants by diacritics, distortion, or orientation.[4]

  • The oldest and largest is the Brahmic family of India and Southeast Asia, in which vowels are marked with diacritics and syllable-final consonants, when they occur, are indicated with ligatures, diacritics, or with a special vowel-canceling mark.
  • In the Ethiopic family, vowels are marked by modifying the shapes of the consonants, and one of the vowel-forms serves additionally to indicate final consonants.
  • In the Cree family, vowels are marked by rotating or flipping the consonants, and final consonants are indicated with either special diacritics or superscript forms of the main initial consonants.

Tāna of the Maldives has dependent vowels and a zero vowel sign, but no inherent vowel.

Feature North Indic South Indic Tāna Ethiopic Canadian
Vowel representation
after consonant
Dependent sign (diacritic)
in distinct position per vowel
Fused diacritic Rotate/reflect
Initial vowel
Distinct inline
letter per vowel
Zero consonant plus
dependent vowel in SEA
Glottal stop
plus dependent
Zero consonant
plus dependent
Inherent vowel
(value of no vowel sign)
[ə], [ɔ], [a], or [o] No [ə] N/A
Zero vowel sign
(sign for no value)
Often Always used when
no final vowel
Consonant cluster Conjunct Stack or separate Separate
Final consonant Inline except , ḥ Inline Dependent
Distinct final sign Only for ṃ, No Only in Western
Final sign position Inline but ṃ top Inline Raised or inline

Indic (Brahmic)

Indic scripts originated in India and spread to Southeast Asia. All surviving Indic scripts are descendants of the Brahmi alphabet. Today they are used in most languages of South Asia (although replaced by Perso-Arabic in Urdu, Kashmiri and some other languages of Pakistan and India) and mainland Southeast Asia (Burma, Thailand, Laos, Cambodia; but not Malaysia or Vietnam). The primary division is into North Indic scripts used in Northern India, Nepal, Tibet and Bhutan, and Southern Indic scripts used in South India, Sri Lanka and Southeast Asia. South Indic letter forms are very rounded; North Indic less so, though Oriya, Golmol and Litumol of Nepal script are rounded.

Most North Indic scripts' full letters incorporate a horizontal line at the top, with Gujarati and Oriya script as exceptions; South Indic scripts do not.

Indic scripts indicate vowels through dependent vowel signs (diacritics) around the consonants, often including a sign that explicitly indicates the lack of a vowel. If a consonant has no vowel sign, this indicates a default vowel. Vowel diacritics may appear above, below, to the left, to the right, or around the consonant.

The most widely used Indic script is Devanagari, shared by Hindi, Bhojpuri, Marathi, Nepali, and often Sanskrit. A basic letter such as क in Hindi represents a syllable with the default vowel, in this case ka ([kə]), or, in final position, a final consonant, in this case k. This inherent vowel may be changed by adding vowel marks (diacritics), producing syllables such as कि ki, कु ku, के ke, को ko. The mora a consonant letter represents, either with or without a marked vowel, is called an akshara.

Diacritic placement in Brahmic abugidas
position syllable pronunciation base form script
above के /keː/ /k(a)/ Devanagari
below कु /ku/
left कि /ki/
right को /koː/
around கௌ /kau/ /ka/ Tamil
surround កៀ /kie/ /kɑɑ/ Khmer
within ಕಿ /ki/ /ka/ Kannada

In many of the Brahmic scripts, a syllable beginning with a cluster is treated as a single character for purposes of vowel marking, so a vowel marker like ि -i, falling before the character it modifies, may appear several positions before the place where it is pronounced. For example, the game cricket in Hindi is क्रिकेट krikeţ; the diacritic for /i/ appears before the consonant cluster /kr/, not before the /r/. A more unusual example is seen in the Batak alphabet: Here the syllable bim is written ba-ma-i-(virama). That is, the vowel diacritic and virama are both written after the consonants for the whole syllable.

In many abugidas, there is also a diacritic to suppress the inherent vowel, yielding the bare consonant. In Devanagari, क् is k, and ल् is l. This is called the virāma or halantam in Sanskrit. It may be used to form consonant clusters, or to indicate that a consonant occurs at the end of a word. Thus in Sanskrit, a default vowel consonant such as क does not take on a final consonant sound. Instead, it keeps its vowel. For writing two consonants without a vowel in between, instead of using diacritics on the first consonant to remove its vowel, another popular method of special conjunct forms is used in which two or more consonant characters are merged to express a cluster, such as Devanagari: क्ल kla. (Note that some fonts display this as क् followed by ल, rather than forming a conjunct. This expedient is used by ISCII and South Asian scripts of Unicode.) Thus a closed syllable such as kal requires two aksharas to write.

The Róng script used for the Lepcha language goes further than other Indic abugidas, in that a single akshara can represent a closed syllable: Not only the vowel, but any final consonant is indicated by a diacritic. For example, the syllable [sok] would be written as something like s̥̽, here with an underring representing /o/ and an overcross representing the diacritic for final /k/. Most other Indic abugidas can only indicate a very limited set of final consonants with diacritics, such as /ŋ/ or /r/, if they can indicate any at all.


In Ethiopic, where the term abugida originates, the diacritics have been fused to the consonants to the point that they must be considered modifications of the form of the letters. Children learn each modification separately, as in a syllabary; nonetheless, the graphic similarities between syllables with the same consonant is readily apparent, unlike the case in a true syllabary.

Though now an abugida, the Ge'ez alphabet, until the advent of Christianity (ca. AD 350), had originally been what would now be termed an abjad. In the Ge'ez abugida (or fidel), the base form of the letter (also known as fidel) may be altered. For example, ሀ [hə] (base form), ሁ hu (with a right-side diacritic that doesn't alter the letter), ሂ hi (with a subdiacritic that compresses the consonant, so it is the same height), ህ [hɨ] or [h] (where the letter is modified with a kink in the left arm).

Canadian Aboriginal syllabics

In the family known as Canadian Aboriginal syllabics, which was inspired by the Devanagari script of India, vowels are indicated by changing the orientation of the syllabogram. Each vowel has a consistent orientation; for example, Inuktitutpi,pu,pa;ti,tu,ta. Although there is a vowel inherent in each, all rotations have equal status and none can be identified as basic. Bare consonants are indicated either by separate diacritics, or by superscript versions of the aksharas; there is no vowel-killer mark.

Borderline cases

Vowelled abjads

Consonantal scripts ("abjads") are normally written without indication of many vowels. However in some contexts like teaching materials or scriptures, Arabic and Hebrew are written with full indication of vowels via diacritic marks (harakat, niqqud) making them effectively abugidas. The Brahmic and Ethiopic families are thought to have originated from the Semitic abjads by the addition of vowel marks.

The Arabic-alphabet scripts used for Kurdish in Iraq and for Uighur in Xinjiang, (People's Republic of China) are fully vowelled, but because the vowels are full letters rather than diacritics and there are no inherent vowels, these are considered alphabets, not abugidas.


The imperial Mongol script called Phagspa was derived from the Tibetan abugida, but all vowels are written in-line rather than as diacritics. However, it retains the features of having an inherent vowel /a/ and having distinct initial vowel letters.


Pahawh Hmong is a non-segmental script that indicates syllable onsets and rimes, such as consonant clusters and vowels with final consonants. Thus it is not segmental and cannot be considered an abugida. However, it superficially resembles an abugida with the roles of consonant and vowel reversed. Most syllables are written with two letters in the order rime–onset (typically vowel-consonant), even though they are pronounced as onset-rime (consonant-vowel), rather like the position of the /i/ vowel in Devanagari, which is written before the consonant. Pahawh is also unusual in that, while an inherent rime /āu/ (with mid tone) is unwritten, it also has an inherent onset /k/. For the syllable /kau/, which requires one or the other of the inherent sounds to be overt, it is /au/ that is written. Thus it is the rime (vowel) which is basic to the system.


It is difficult to draw a dividing line between abugidas and other segmental scripts. For example, the Meroitic script of ancient Sudan did not indicate an inherent a (one symbol stood for both m and ma, for example), and is thus similar to Brahmic family of abugidas. However, the other vowels were indicated with full letters, not diacritics or modification, so the system was essentially an alphabet that did not bother to write the most common vowel.


Several systems of "vowel indication" using the positioning or choice of consonant signs so that writing vowel-marks can be dispensed with.


As the term alphasyllabary suggests, abugidas have been considered an intermediate step between alphabets and syllabaries. Historically, abugidas appear to have evolved from abjads (vowelless alphabets). They contrast with syllabaries, where there is a distinct symbol for each syllable or consonant-vowel combination, and where these have no systematic similarity to each other, and typically develop directly from logographic scripts. Compare the Devanagari examples above to sets of syllables in the Japanese hiragana syllabary: か ka, き ki, く ku, け ke, こ ko have nothing in common to indicate k; while ら ra, り ri, る ru, れ re, ろ ro have neither anything in common for r, nor anything to indicate that they have the same vowels as the k set.

Most Indian and Indochinese abugidas appear to have first been developed from abjads with the Kharoṣṭhī and Brāhmī scripts; the abjad in question is usually considered to be the Aramaic one, but while the link between Aramaic and Kharosthi is more or less undisputed, this is not the case with Brahmi. The Kharosthi family does not survive today, but Brahmi's descendants include most of the modern scripts of South and Southeast Asia. Ge'ez derived from a different abjad, the Sabean script of Yemen; the advent of vowels coincided with the introduction of Christianity about AD 350;.[5]

Other types of writing systems

Partial list of abugidas

For a more complete list, see List of writing systems.

Abugida-like scripts

  • Meroitic (extinct) (an alphabet with an inherent vowel)


External links

  • Omniglot's list of abugidas, including examples of various writing systems
  • Alphabets – list of abugidas and other scripts (in Spanish)
  • Comparing Devanagari with Burmese, Khmer, Thai, and Tai Tham scripts
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