A diacritic, also known as a diacritical mark, is a symbol or glyph added to a letter or character to indicate a different pronunciation or stress or to distinguish between similar words. Examples of diacritical marks include the acute accent (é) in the word “résumé,” the cedilla (ç) in the word “façade,” and the tilde (ñ) in the word “señor.” These diacritics can change the meaning of words in many languages, such as Spanish, French, and Portuguese.

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Rules of diacritics
The rules for using diacritics vary depending on the language and the specific diacritical marks. However, some general guidelines include the following:
- Diacritics are often used to indicate the pronunciation of a letter, such as the acute accent (é) in Spanish words like “perro” (dog) and “perré” (doggy).
- They can also distinguish between words that would otherwise be spelled the same, such as “café” (coffee) and “cafe” (cafeteria).
- Some languages, such as French, have specific rules for when diacritics should be used. For example, in French, the circumflex accent (â, ê, î, ô, û) is used to indicate a letter that used to be present in the world but has been lost over time.
- In German, the umlaut (ä, ö, ü) changes the vowel sound of a word.
- Diacritics are also used in many African, Asian, and Oceanic languages to indicate tones or other language features.
It’s important to note that different languages have different rules and conventions for using diacritics, and it’s important to consult a dictionary or language guide if you are unsure of the correct usage.
Use of diacritics in the English language
Diacritics are not commonly used in the English language, but there are a few instances where they may be used.
- In linguistics, diacritics may indicate specific pronunciation or phonetic features of a word or sound. For example, the International Phonetic Alphabet (IPA) uses diacritics to indicate stress, tone, and other features of speech sounds.
- In some proper nouns and foreign words borrowed from English, diacritics are retained to indicate the original spelling and pronunciation. For example, “résumé” or “naïveté”
- Diacritics may indicate a special meaning or distinguish between similar words in academic writing.
- Diacritics are sometimes used for stylistic or aesthetic reasons, such as in poetry or advertising.
It is worth noting that diacritics are not commonly used in English, and in most cases, words can be written without them and still be understood correctly.