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The opposite is the breve ⟨?⟩, which marks a short or light syllable or a short vowel.
In Greco-Roman metrics and in the description of the metrics of other literatures, the macron was introduced and is still widely used to mark a long (heavy) syllable. Even relatively recent classical Greek and Latin dictionaries are still concerned with indicating only the length (weight) of syllables; that is why most still do not indicate the length of vowels in syllables that are otherwise metrically determined. Many textbooks about Ancient Rome and Greece use the macron, even if it was not actually used at that time.
The following languages or transliteration systems use the macron to mark long vowels:
Slavicists use the macron to indicate a non-tonic long vowel, or a non-tonic syllabic liquid, such as on l, lj, m, n, nj, and r. Languages with this feature include standard and dialect varieties of Serbo-Croatian, Slovene, and Bulgarian.
Transcriptions of Arabic typically use macrons to indicate long vowels - ? (alif when pronounced /a:/), ? (waw, when pronounced /u:/ or /o:/), and ? (ya', when pronounced /i:/ or /e:/). Thus the Arabic word (three) is transliterated thal?thah.
Transcriptions of Sanskrit typically use a macron over ?, ?, ?, ?, and ? in order to mark a long vowel (e and o are always long and consequently do not need any macron).
In Latin, many of the more recent dictionaries and learning materials use the macron as the modern equivalent of the ancient Roman apex to mark long vowels. Any of the 6 vowel letters (?, ?, ?, ?, ?, ?) can bear it. It is sometimes used in conjunction with the breve, especially to distinguish the short vowels /i/ and /u/ from their semi-vowel counterparts /j/ and /w/, originally, and often to this day, spelt with the same letters. However, the older of these editions are not always explicit on whether they mark long vowels or heavy syllables - a confusion that is even found in some modern learning materials. In addition, most of the newest academic publications use both the macron and the breve sparingly, mainly when vowel length is relevant to the discussion.
In romanization of classical Greek, the letters ? (eta) and ? (omega) are transliterated, respectively, as ? and ?, representing the long vowels of classical Greek, whereas the short vowels ? (epsilon) and ? (omicron) are always transliterated as plain e and o. The other long vowel phonemes don't have dedicated letters in the Greek alphabet, being indicated by digraphs (transliterated likewise as digraphs) or by the letters ?, ? , ? - represented as ?, ?, ?. The same three letters are transliterated as plain a, i, u when representing short vowels.
Latvian. ?, ?, ?, ? are separate letters but are given the same position in collation as a, e, i, u respectively. ? was also used in Latvian, but it was discarded as of 1946.
Lithuanian. ? is a separate letter but is given the same position in collation as the unaccented u. It marks a long vowel; other long vowels are indicated with an ogonek (which used to indicate nasalization, but it no longer does): ?, ?, ?, ? and o being always long in Lithuanian except for some recent loanwords. For the long counterpart of i, y is used.
Livonian. ?, ?, ?, ?, ?, ?, ? and ? are separate letters that sort in alphabetical order immediately after a, ä, e, i, o, ?, õ, and u, respectively.
Samogitian. ?, ?, , ?, ? and ? are separate letters that sort in alphabetical order immediately after a, e, ?, i, u and o respectively.
Transcriptions of Nahuatl, the Aztecs' language, spoken in Mexico. When the Spanish conquistadors arrived, they wrote the language in their own alphabet without distinguishing long vowels. Over a century later, in 1645, Horacio Carochi defined macrons to mark long vowels ?, ?, ? and ?, and short vowels with grave (`) accents. This is rare nowadays since many people write Nahuatl without any orthographic sign and with the letters k, s and w, not present in the original alphabet.
Cook Islands M?ori. In Cook Islands M?ori, the macron or m?kar?na is not commonly used in writing, but is used in references and teaching materials for those learning the language.
Hawaiian. The macron is called kahak?, and it indicates vowel length, which changes meaning and the placement of stress.
M?ori. In modern written M?ori, the macron is used to designate long vowels, with the trema mark sometimes used if the macron is unavailable (e.g. "Mäori"). The M?ori word for macron is tohut?. The term p?tae ("hat") is also used. In the past, writing in M?ori either did not distinguish vowel length, or doubled long vowels (e.g. "Maaori"), as some iwi dialects still do.
Niuean. In Niuean, "popular spelling" does not worry too much about vowel quantity (length), so the macron is primarily used in scholarly study of the language.
Tahitian. The use of the macron is comparatively recent in Tahitian. The Fare V?naʻa or Académie Tahitienne (Tahitian Academy) recommends using the macron, called the t?rava, to represent long vowels in written text, especially for scientific or teaching texts and it has widespread acceptance. (In the past, written Tahitian either did not distinguish vowel length, or used multiple other ways).
Tongan and Samoan. The macron is called the toloi/fakamamafa or fa'amamafa, respectively. Its usage is similar to that in M?ori, including its substitution by a trema. Its usage is not universal in Samoan, but recent academic publications and advanced study textbooks promote its use.
The macron is used in Fijian language dictionaries, in instructional materials for non-Fijian speakers, and in books and papers on Fijian linguistics. It is not typically used in Fijian publications intended for fluent speakers, where context is usually sufficient for a reader to distinguish between heteronyms.
Similarly in the Yale romanization of Cantonese, macrons over a, e, i, o, u, m, n (?, ?, ?, ?, ?, m?, n?) indicate the high level tone of Cantonese. Like Mandarin, the alternative to the macron is the number 1 after the syllable (for example, t? = ta1).
In Pe?h-?e-j? romanization of Hokkien, macrons over a, e, i, m, n, o, o?, u, (?, ?, ?, m?, n?, ?, , ?) indicate the mid level tone ("light departing" or 7th tone) of Hokkien.
Sometimes the macron marks an omitted n or m, like the tilde:
In Old English texts a macron above a letter indicates the omission of an m or n that would normally follow that letter.
In older handwriting such as the German Kurrentschrift, the macron over an a-e-i-o-u or ä-ö-ü stood for an n, or over an m or an n meant that the letter was doubled. This continued into print in English in the sixteenth century, and to some extent in German. Over a u at the end of a word, the macron indicated um as a form of scribal abbreviation.
The macron is used in the orthography of a number of vernacular languages of the Solomon Islands and Vanuatu, particularly those first transcribed by Anglican missionaries. The macron has no unique value, and is simply used to distinguish between two different phonemes.
Thus, in several languages of the Banks Islands, including Mwotlap, the simple m stands for /m/, but an m with a macron (m?) is a rounded labial-velar nasal/m?/; while the simple n stands for the common alveolar nasal/n/, an n with macron (n?) represents the velar nasal/?/; the vowel ? stands for a (short) higher /?/ by contrast with plain e/?/; likewise ?/?/ contrasts with plain o/?/.
In Bislama (orthography before 1995), Lamenu and Lewo, a macron is used on two letters m? p?.m? represents /m?/, and p? represents /p?/. The orthography after 1995 (which has no diacritics) has these written as mw and pw.
In Marshallese, a macron is used on four letters - ? n? ? ? - whose pronunciations differ from the unmarked a n o u. Marshallese uses a vertical vowel system with three to four vowel phonemes, but traditionally their allophones have been written out, so vowel letters with macron are used for some of these allophones. Though the standard diacritic involved is a macron, there are no other diacritics used above letters, so in practice other diacritics can and have been used in less polished writing or print, yielding nonstandard letters like ã ñ õ û, depending on displayability of letters in computer fonts.
In Russian cursive, as well as in some others based on the Cyrillic script (for example, Bulgarian), a lowercase ? looks like a lowercase m, and a macron is often used to distinguish it from ?, which looks like a lowercase w (see ?). Some writers also underline the letter ? to reduce ambiguity further.
Also, in some instances, a diacritic will be written like a macron, although it represents another diacritic whose standard form is different:
In some Finnish, Estonian and Swedish comic books that are hand-lettered, or in handwriting, a macron-style umlaut is used for ä or ö (also õ and ü in Estonian), sometimes known colloquially as a "lazy man's umlaut". This can also be seen in some modern handwritten German.
In Norwegian?,?, ?, ? and ? can be used for decorative purposes both in handwritten and computed Bokmål and Nynorsk or to denote vowel length such as in d? (you), l? (infinitive form of to let), l?ser (present form of "to read") and l?ft (air). The diacritic is entirely optional, carries no IPA value and is seldom used in modern Norwegian outside of handwriting.
In informal Hungarian handwriting, a macron is often a substitute for either a double acute accent or an umlaut (e.g., ö or ?). Because of this ambiguity, using it is often regarded as bad practice.
In informal handwriting, the Spanishñ is sometimes written with a macron-shaped tilde: (n?).
In LaTeX a macron is created with the command "\=", for example: M\=aori for M?ori.
In OpenOffice, if the extension Compose Special Characters is installed, a macron may be added by following the letter with a hyphen and pressing the user's predefined shortcut key for composing special characters. A macron may also be added by following the letter with the character's four-digit hex-code, and pressing the user's predefined shortcut key for adding unicode characters.
^P.G.W. Glare (ed.), Oxford Latin Dictionary (Oxford at the Clarendon Press 1990), p. xxiii: Vowel quantities. Normally, only long vowels in a metrically indeterminate position are marked.
^ ?, ?,, 1978, p. 19: ...? ....? ? ? ?-.?, ? ? ? ? , . 151.. (in Bulgarian)
^Iluta Dalbi?a un Inese Launiece (2001). Latvie?u valoda vidusskol?m. R?ga: RaKa. p. 110. ISBN978-9984-46-130-4.
^Buse, Jasper with Taringa, Raututi (Bruce Biggs and Rangi Moekaʻa, eds.). (1996). Cook Islands Maori Dictionary with English-Cook Islands Maori Finder List. Avarua, Rarotonga: The Ministry of Education, Government of the Cook Islands; The School of Oriental and African Studies, The University of London; The Institute of Pacific Studies, The University of the South Pacific; The Centre for Pacific Studies, The University of Auckland; Pacific Linguistics, The Research School of Pacific and Asian Studies, The Australian National University.
^Carpentier, Tai Tepuaoter? Turepu and Beaumont, Clive. (1995). Kai k?rero: A Cook Islands Maori Language Coursebook. Auckland, New Zealand: Pasifika Press.