From Gerald Erichsen,
Your Guide to Spanish Language.
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Definition: A mark that is placed on a letter to indicate that it has a different pronunciation than it would otherwise, or to indicate that the word has a different meaning than it would otherwise.

English uses diacritical marks almost solely in words of foreign origin, and they are often omitted. Examples of English words using diacritical marks are "façade" (which uses a cedilla), "résumé" (two accent marks), "naïve" (umlaut) and "piñata" (tilde).

Spanish uses three types of diacritical marks:

• The tilde is used to distinguish n from ñ. In a technical sense, this might not be considered a diacritical mark, since n and ñ are separate letters of the alphabet.
• Accent marks are used as an aid in pronunciation and also to distinguish some sets of words that are otherwise spelled alike and pronounced alike but have different meanings or different grammatical usages.
• The umlaut, often called a dieresis, which is placed over the u when it pronounced after a g in the combinations güe and güi. Umlauts are rarer than the other types of diacritical marks.

Also Known As: "Diacritic" in English, diacrítico in Spanish.

Examples: Many Spanish words such as árbol use accents to put the stress on the correct syllable. Accents are frequently used with some words such as qué and cuál when they are used in questions. There are also a few pairs of completely different words such as se (a reflexive pronoun) and sé (a conjugated form of either saber or ser) that use such accents. Words using umlauts include argüir and güisqui.