The Modern French languages evolved from Vulgar Latin, which came from Classical Latin with important Germanic influences from the Germanic tribes that inhabited Europe during Roman times. It has passed through several recognizable stages: Old French, from 842; Middle French from circa 1400; early Modern French from circa 1600 and Contemporary French, from circa 1800, marked by certain spelling reforms listed below.
Spelling and punctuation before the 16th century was highly erratic, but the introduction of printing in 1470 provoked the need for uniformity.
Several Renaissance humanists (working with publishers) proposed reforms in French orthography, the most famous being Jacques Peletier du Mans who developed a phonemic-based spelling system and introduced new typographic signs (1550). Peletier continued to use his system in all his published works, but his reform was not followed.
The third (1740) and fourth (1762) editions of the Académie dictionary were very progressive ones, changing the spelling of about half the words altogether.
Diacritics, which had been in common use by printers for a long time, were finally adopted by the Académie, and many silent letters were dropped.
Many changes suggested in the fourth edition were later abandoned along with thousands of neologisms added to it.
Very importantly too, subsequent 18th century editions of the dictionary added the letters J and V to the French alphabet in replacement of consonant I and U, fixing many cases of homography.
Many changes were introduced in the sixth edition of the Académie dictionary (1835), mainly under the influence of Voltaire. Most importantly, all OI digraphs that represented /ɛ/ were changed to AI, thus changing the whole imperfect conjugation of all verbs. The borrowing of connoisseur into English predates this change; the modern French spelling is connaisseur.
The spelling of some plural words the singular form of which ended in D and T was modified to reinsert this mute consonant, so as to bring the plural in morphological alignment with the singular. Only gent, gens retained the old form, because it was perceived that the singular and the plural had different meanings. The Académie had already tried to introduce a similar reform in 1694, but had given up with their dictionary's second edition.
With important dictionaries published at the turn of 20th century, such as Émile Littré's, Pierre Larousse's and Arsène Darmesteter's, and later Paul Robert's, the Académie gradually lost much of its prestige.
Hence, new reforms suggested in 1901, 1935, and 1975 were almost totally ignored, except for the replacement of apostrophes with hyphens in some cases of (potential) elision in 1935.
Since the 1970s, though, calls for the modernisation of French orthography have grown stronger. In 1989, French prime minister Michel Rocard appointed the Superior Council of the French language to simplify the orthography by regularising it.
The Council, with the help of some Académie members and observers from Francophone states, published what it called the "orthographic rectifications" on 6 December 1990.
Those "rectifications", instead of changing individual spellings, published general rules or lists of modified words. In total, around 2000 words have seen their spelling changed, and French morphology was also affected.
Numerals are joined with hyphens:
Elements of compound nouns are fused together:
Loan compounds are also fused together:
Compound nouns joined with hyphens (or fused) make their plural using normal rules, that is adding a final s or x, unless the modifier is an adjective (in which case both elements must agree), or the head is a determined noun, or a proper noun:
Loanwords also have a regular plural:
The tréma (known as diaeresis in English) indicating exceptionally that gu is not a digraph is to be placed on the u instead of on the following vowel. Also, such trémas are added to words where they were not previously used:
Examples of where the tréma is found
Verbs with their infinitive in éCer (where C can be any consonant) change their é to è in the future and conditional:
Additionally, verbs ending in e placed before an inverted subject "je" change their e to è instead of é:
Circumflex accents are removed on i and u if they are not needed to distinguish between homographs. They are retained in the simple past and subjunctive of verbs:
Wherever accents are missing or wrong because of past error/omission or change of pronunciation, they are added or changed:
Accents are also added to loanwords where dictated by French pronunciation:
In verbs with an infinitive in -eler or -eter, the opening of the schwa can currently be noted either by changing the e to è or by doubling the following l or t, depending on verbs. Only the first rule shall now be used except in appeler, jeter, and their derivatives (which continue to use ll and tt).
This applies also when those verbs are nominalized using the suffix -ement:
Notwithstanding the normal rules (see French verbs), the past participle laissé followed by an infinitive never agrees with the object:
This is an alleged simplification of the rules governing the agreement as applied to a past participle followed by an infinitive. The participle fait already followed an identical rule.
Many phenomena were considered as "anomalies" and thus "corrected". Some "families" of words from the same root showing inconsistent spellings were uniformized on the model of the most usual word in the "family".
This rule was also extended to suffixes in two cases, actually changing them into totally different morphemes altogether:
Isolated words were adjusted to follow older reform where they had been omitted:
Lastly, some words have simply seen their spelling simplified, or fixed when it was uncertain: