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This article is about the spelling reforms of the Portuguese language.
Historical background 
Portuguese began to be used regularly in documents and poetry around the 12th century. In 1290, King Diniz created the first Portuguese University in Lisbon (later moved to Coimbra) and decreed that Portuguese, then called simply the "Common language" would henceforth be used instead of Latin, and named the "Portuguese language." In 1296, it was adopted by the Royal Chancellary and began to be used for writing laws and in notaries.
The medieval spelling of Portuguese was not uniform, since it had no official standard, but most authors used an essentially phonemic orthography, with minor concessions to etymology common in other Romance languages, such as the use of c for /ts/ before e or i, but ç otherwise, or the use of ss for /s/ between vowels, but s otherwise. King Diniz, who was an admirer of the poetry of the troubadours and a poet himself, popularized the Occitan digraphs nh and lh for the palatal consonants /ɲ/ and /ʎ/, which until then had been spelled with several digraphs, including nn and ll, as in Spanish.
During the Renaissance, appreciation for classical culture led many authors to imitate Latin and (Romanized) Ancient Greek, filling words with a profusion of silent letters and other etymological graphemes, such as ch (pronounced as c/qu), ph (pronounced as f), rh, th, y (pronounced as i), cc, pp, tt, mn (pronounced as n), sce, sci (pronounced as ce, ci), bt, pt, mpt (pronounced as t), and so on, still found today in the orthographies of French and English.
Contrary to neighboring languages such as Spanish or French, whose orthographies were set by language academies in the 17th century, Portuguese had no official spelling until the early 20th century; authors wrote as they pleased.
Orthographic standardization 
In 1911, the newly formed Portuguese Republic, concerned with improving the literacy of its citizens, charged a commission of philologists with defining a standard orthography for Portuguese. The result was what has come to be known in Portugal as the orthographic reform of Gonçalves Viana. The new standard became official in Portugal and its overseas territories at the time, which are today the independent nations of Angola, Cape Verde, Guinea-Bissau, Mozambique, São Tomé and Príncipe, and East Timor, as well as the Chinese S.A.R. of Macau and Indian territories of Goa, Daman and Diu, and Dadra and Nagar Haveli. In 1938, Brazil set up an orthography of its own, with the same general principles as the Portuguese orthography, but not entirely identical to it.
Basic principles 
The authors of the first spelling reform of Portuguese, imbued with the modern ideas of phonology, rejected the etymological spellings current in the previous centuries, preferring a more phonetic orthography, like those of Spanish and Italian. On the other hand, considering that the period of Galician-Portuguese troubadorian poetry had been a golden age of Portuguese literature, they aimed to keep the new orthography as close to the medieval spelling as possible, in spite of some phonetic changes which the language had undergone. The resulting orthographic standard was essentially a compromise between these intents, on one hand, and common traditions, on the other: in a few cases, spelling conventions which went against etymology but had long become customary were made official.
Thus, the reform kept some graphemic distinctions for phonological traits which were not present in every dialect, but still present in at least some ares: between z and intervocalic s (/dz/ and /z/ in medieval Portuguese, but now reduced to /z/ in most dialects), between c/ç and s(s) (/ts/ and /s/ in medieval Portuguese, but now reduced to /s/ in most dialects), and between ch and x (originally /tʃ/ and /ʃ/, now just /ʃ/ in most dialects, although the distinction is still retained in some). The unstressed vowels e and o were also retained for word-family homogeneity and etymology when they were pronounced as i or u, respectively, and the digraph ou was differentiated from o, even though many speakers now pronounced both as /o/. These distinctions have close parallels in the orthographies of other West European languages.
Since word stress can be distinctive in Portuguese, the acute accent was used to mark the stressed vowel whenever it doesn't fall over the predicted vowel, more or less as in the orthographies of Spanish and Catalan. For example, the verb critica "he criticizes" bears no accent mark, because it is stressed on the syllable before the last one, like most words that end in -a, but the noun crítica "criticism" requires an accent mark, since it is a proparoxytone.
Since the height of the vowels a, e and o is also distinctive in stressed syllables (see Portuguese phonology), high stressed vowels were marked with a circumflex accent, â, ê, ô, to be differentiated from the low stressed vowels written á, é, ó. The choice of the acute for low vowels and the circumflex for high vowels went against the conventions of other Romance languages such as French or Italian, but it was already commonplace in Portuguese before the 20th century. (In many words, Portuguese ê and ô correspond to the Latin long vowels ē, ō.)
Nasal vowels and nasal diphthongs usually appear before the orthographic nasal consonants n, m, in which case they do not need to be identified with diacritics, but the tilde was placed on nasal a and nasal o when they occurred before another letter, or at the end of a word. Although the vowel u can also be nasal before other vowels, this happens in so few words (mui, muito, muita, muitos, muitas) that marking its nasality was not considered necessary.
The acute accent was used also to mark the second vowel of a hiatus in a stressed syllable, where a diphthong would normally be expected, distinguishing for example conclui "he concludes" from concluí "I concluded", saia "that he leave" from saía "he used to leave", or fluido "fluid" from fluído "flowed".
Initially, the orthographic system, both in Brazil and Portugal, determined the usage of diacritics in cases where two words would otherwise be homographic but not homophonous, such as acôrdo, "agreement", distinguishing it from acórdo, "I wake up". This principled was abandoned in all but a dozen cases in 1945 in Portugal and in 1973 in Brazil.
The orthography set by the 1911 reform is essentially the one still in use today on both sides of the Atlantic with only minor adjustments having been made to the vowels, consonants, and digraphs. Where there have been substantial changes since then, and there were still currently significant differences between the Portuguese orthography and the Brazilian orthography until de 1990 spelling reform, was in the use of diacritics and silent consonants.
Portuguese orthography vs. Brazilian orthography 
Brazil was never consulted about the orthographic reform of 1911, and so it did not adopt it. In the decades which followed, negotiations were held between representatives of Brazil and Portugal, with the intent of agreeing on a uniform orthography for Portuguese, but progress was slow. In 1931, Portugal and Brazil finally signed an orthographic agreement, on the basis of which Brazil established its own official orthography, in 1938.
Soon after, however, it became apparent that there were differences between the spellings being used in the two countries. Even though both were based on the same general principles, phonetic differences between European Portuguese and Brazilian Portuguese had led to divergent spellings in some cases. Various attempts were made in the remainder of the 20th century to bring the two orthographies closer to each other, sometimes with modest success, other times without success. To this day, they do not coincide completely.
Problems with the original orthography 
Notwithstanding its traces of etymology, the 1911 orthography aimed to be phonetic in the sense that, given the spelling of a word, there would be no ambiguity about its pronunciation. For that reason, it had certain characteristics which later produced inconsistencies between the European and the Brazilian orthographies.
In unstressed syllables, hiatuses were originally distinguished from diphthongs with a trema. For instance, writing saüdade, traïdor, constituïção, so that they would be pronounced sa-udade, tra-idor, constitu-ição. But the pronunciation of these words is not uniform. Many speakers say sau-dade and trai-dor, especially in fast speech. Furthermore, there are no minimal pairs that distinguish a hiatus from a falling diphthong in unstressed syllables. For this reason, marking unstressed hiatuses came to be seen as unnecessary, and these tremas were eventually abolished.
The trema was also used in the words where the letter u is, exceptionally, pronounced in the digraphs gue, gui, que, qui, rather than silent as usual; e.g. agüentar, sagüim, freqüente, eqüidade. However, there is regional variation, with for example the u being pronounced in a few Brazilian Portuguese accents qüestão (though it was never accepted as a possible writing), but not in European Portuguese questão. Although the number of words with such divergent pronunciations is small, they have been seen as an obstacle to the orthographic unification of the language.
Unstressed vowels are usually high, but there are exceptions, including a few pairs of homographs in European Portuguese which vary only in having either a low or a high vowel in an unstressed syllable. To distinguish these, the grave accent was at first placed on unstressed low vowels: cf. pregar "to nail", where the e is pronounced /ɨ/ in European Portuguese, with prègar "to preach", where è is pronounced /ɛ/, or molhada /u/ "wet" with mòlhada /ɔ/ "bundle". But in Brazilian Portuguese both words in each example are pronounced the same way, so the grave accent is not used: pregar /e/ "to nail/to preach", molhada /o/ "wet/bundle"; the intended meaning is inferred from context. The grave accent was eventually abolished, except in a small number of contractions.
In other cases, where an unstressed low vowel was the result of the elision of the consonants c or p before c, ç, p, the consonant was kept in the spelling, to denote the quality of the preceding vowel. For example, in the word intercepção, which is stressed on its last syllable, the letter p is not pronounced, but indicates that the second e is pronounced /ɛ/, as opposed to the second e in intercessão, which is pronounced /ɨ/. Other examples of words where a silent consonant was left to lower the previous vowel are objecção and factor. In Brazilian Portuguese, the vowels in question are pronounced just like any other unstressed vowels, and, since there is no phonetic ambiguity to undo, the words are simply spelled objeção, fator, and so on.
The orthography distinguished between stressed éi and stressed ei. In Brazilian Portuguese, these diphthongs are indeed different, but in most dialects of European Portuguese both are pronounced the same way, and éi appears only by convention in some oxytone plural nouns and adjectives. This led to divergent spellings such as idéia (Brazil) and ideia (Portugal).
The Brazilian spelling has a, ê or ô in several words where the European orthography has á, é or ó, due to different pronunciation. For example, cf. pensamos, gênero, tônico (Brazil) with pensámos, género, tónico (Portugal). This happens when the vowels are stressed before the nasal consonants m or n, followed by another vowel, in which case both types of vowel may occur in European Portuguese, but Brazilian Portuguese allows only high vowels.
A timeline of spelling reforms 
- 1911: First spelling reform in Portugal.
- 1931: Orthographic agreement between Portugal and Brazil. Silent s abolished from words such as sciência, scena, scéptico, etc., and spellings like dir-se há and amar-te hei changed to dir-se-á and amar-te-ei.
- 1937: First proposal of orthographic reform in Brazil is mentioned by the Constitution but not enforced.
- 1943: First orthographic reform of Brazil is delineated in the Vocabulário Ortográfico da Língua Portuguesa, by the Academia Brasileira de Letras.
- 1945: Sweeping spelling reform in Portugal eliminates the trema, and differential circumflex accents in most pairs of homographs such as acêrto and acerto, cêrca and cerca, côr and cor, fôra and fora, dêsse and desse, and so on.
- 1946: The Constitution of Brazil makes the orthographic reform of 1943 official and mandates that all books published in the country use the official spelling.
- 1971: Sweeping spelling reform in Brazil eliminates the trema in hiatuses, most differential circumflexes, and accent marks on vowels with secondary stressed syllables in compounds, such as ràpidamente, ùltimamente, cortêsmente, cafèzinho, and so on. This reform was mockingly nicknamed the "Remington Reform" because it reduced dramatically the amount of words bearing accents (the reference is to Remington Rand which manufactured both typewriters and rifles in Brazil, either because the reform made typewriting easier or because it "executed" a large number of diacritics).
- 1973: Portugal follows Brazil in abolishing accent marks in secondary stressed syllables.
- 1986: Brazil invites the other six Portuguese language countries, Angola, Cape Verde, Guinea-Bissau, Mozambique, Portugal and São Tomé and Príncipe, to a meeting in Rio de Janeiro to address the remaining problems. A radical reform which would eliminate the acute accent and the circumflex accent from all words except oxytones (as in the orthography of Italian) is proposed, but ill-received by both the Brazilian and the Portuguese media and public, and subsequently abandoned.
- 1990: A new orthographic agreement is reached between Brazil, Portugal and the other Portuguese-speaking countries. Not so radical as the 1986 attempt, it proposes a compromise between the two orthographic systems.
- 2009: The new 1990 spelling reform goes into effect in Brazil and in Portugal, changing the rules of capitalization and hyphen usage, eliminating the trema completely from the language (except for foreign words), changing the diphthongs "éi" and "ói" into "ei" and "oi", respectively in paroxytone words which don't end with a coda /r/, and eliminated silent letters as in acção or óptimo, which are now spelled ação and ótimo.
The Orthographic Agreement of 1990 
In 1990, an orthographic agreement was reached between the Portuguese-language countries with the intent of creating a single common orthography for Portuguese.
This spelling reform went into effect in Brazil on January 1, 2009. In Portugal, the reform was signed into law by the President on July 21, 2008 allowing for a 6-year adaptation period, during which both orthographies will co-exist. A group of citizens, led by some well known representatives, do not agree with the reform and a petition was created with 120 000 signatures in order to suspend the law. Regardless, the petition was dismissed by the parliament and the new orthography is being swiftly adopted, from major newspapers (e.g. Expresso, Sol, Record) to dictionary publishers (e.g. Leya) to computer spellcheckers (e.g. Priberam, Microsoft Office 2010).
The legality of this decision is questioned, as the main bases of the International Treaty that governs the application of the new spelling reform are yet to be established, chiefly the common vocabulary drawn by all participating countries, that still does not exist. Also, the application of International Treaties, as per the Vienna Convention, states that the text of a treaty cannot be changed, and this one has suffered at least two revisions.
- [www.ipetitions.com/petition/manifestolinguaportuguesa/ Petitions against the Agreement]
See also 
- Portuguese orthography
- Academia Brasileira de Letras
- Wikisource in Portuguese - Ortografia da Língua Portuguesa
- Estrela, Edite A questão ortográfica — Reforma e acordos da língua portuguesa (1993) Editorial Notícias
- Full text of the Pequeno Vocabulário Ortográfico da Língua Portuguesa (Abridged Orthographic Vocabulary of the Portuguese Language) published by the Brazilian Academy of Letters in 1943.
- Text of the decree of the Brazilian government, in 1971, amending the orthography adopted in 1943 (no updated version of the PVOLP was published).
- lusografia.org — Orthographic Agreement of 1990 (PDF - in Portuguese)
- Ciberdúvidas — O Acordo Ortográfico, de novo (in Portuguese)
- Portal da Língua Portuguesa — Acordo ortográfico (in Portuguese)
- Portuguese spelling reforms at International Writing System Reforms and Revolutions
- Official source about Portuguese spelling reforms with studies and guides(in Portuguese)
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