Stress and Accentuation (Acento y Acentuación)
The Spanish words may be stressed on the ultimate, penultimate or antepenultimate
syllable.
According to the Spanish Grammar they are called respectively palabras agudas
(stressed on the ultimate syllable), palabras llanas (stressed on the penultimate
syllable) and palabras esdrújulas (stressed on the antepenultimate syllable).
The stressed syllables may be easily recognized in writing because of the following
rules:
The words terminated by a consonant, except for N, S, are stressed on the
ultimate syllable (i.e. they are palabras agudas), cf.:
manual manual, pared wall.
The words terminated by a vowel or N, S are stressed on the penultimate
syllable (i.e. they are palabras llanas), cf.:
gato cat, cantan they sing, menos less.
All the words, that are stressed not in accordance to the above rules, have a
graphic accent (á, é, í, ó, ú) on the stressed vowels, cf.:
sofá sofa, carbón charcoal, detrás behind, árbol tree,
bolígrafo ball pen, lámpara lamp, pájaro bird.
NOTE: All palabras esdrújulas bear graphic accent.
Besides this, there are used diacritical accents (acentos diacriticos) to distinguish
words with different meanings, cf.:
el the (for masculine) vs. él he
mas but (conj.) vs. más more (adv.) etc.