If I hear the word pronounced, I can tell whether it's -ía or -ia based on whether the "i" has its own syllable or not. Likewise, I can look it up in a dictionary. But apart from that, how can I tell if I should use the tilde or not?

An example of a word with the ending of -ía is sangría, which according to Wiktionary has an etymology of "From sangre (“blood”) +‎ -ía".

An example of a word with the ending of -ia is altisonancia, which according to Wiktionary has an etymology of "altisonante +‎ -ia".

Words borrowed from Latin and then Ancient Greek don't seem to be any more consistent. One word with -ía is policía, which is "From Latin politīa, from Ancient Greek πολιτεία (politeía)." One word with -ia is historia which is "Borrowed from Latin historia, from Ancient Greek ἱστορία (historía)."

One piece of useful information I found was that -ería is a common suffix, while there doesn't seem to be a suffix of "-eria". (Are there any words ending with eria?)

  • "Materia" comes to mind...
    – wimi
    Feb 1, 2020 at 11:58
  • and also: la feria (a fair, or money in slang). Feb 1, 2020 at 20:26
  • @aparente001 wow, I learned something now, that must be a quite localized slang ;)
    – wimi
    Feb 2, 2020 at 9:51
  • Look for something called Diptongo
    – Iria
    Feb 2, 2020 at 10:37

1 Answer 1


As can be seen from your examples, it is often arbitrary, and many times the presence or absence of an accent on the /i/ already happened in a previous etimological step (Latin historia vs politīa). So in many cases, one just has to learn the specific cases by heart, or dig up their etymology.

As you said, there are some suffixes that make this task easier. The following is a non-exhaustive list:

Without accent

  • Nouns ending in -ncia coming from adjectives ending in -nte: redundancia, resistencia. Exception: mercancía. Note also: alcancía does not come from an adjective.

  • Adjectives ending in -ario, -aria: becaria, monetaria

  • Present tense of most verbs in -iar whose infinitive has more than two syllables: alivia, escancia. But not all: avería.

  • Most words ending in -eria without this being a suffix or verb tense as explained below seem to not take an accent: materia, bacteria

  • Most countries: Alemania, Finlandia. Exception: Turquía.

  • Suffix -cracia, meaning "power, government": democracia, aristocracia.

  • Suffix -algia, meaning "pain": nostalgia, mialgia.

With accent

  • Verb tenses: first and third person singular of condicional of all verbs (cantaría, bebería) and pretérito imperfecto of verbs in -er, -ir (comía, vivía).

  • Present tense of most verbs in -iar whose infinitive has one or two syllables: fía, amplía. But not all: cambia.

  • Suffix -ería for shops, sets, or for making nouns out of adjectives: carnicería, palabrería, pedantería.

  • Suffixes -logía for sciences (geología, antropología) and -sofía (filosofía).

  • Suffix -nomía meaning "set of laws/rules": autonomía, astronomía. Exception: antinomia.

  • Suffix -fonía meaning "sound": afonía, cacofonía.

  • Suffix -arquía, meaning "power, government": monarquía, jerarquía.

  • This is a very nice list! The rules of thumb about the verbs are new to me. I only wanted to add that the rules from etymology are indeed somewhat arbitrary as shown by the comparison with Portuguese: words in -cracia, -rgia and -algia are stressed on the i, but polícia shifts the stress to the previous syllable.
    – pablodf76
    Feb 1, 2020 at 22:36
  • This is a good answer. How did you go about building the list of what's -ia and what's -ía?
    – Golden Cuy
    Feb 2, 2020 at 3:15
  • 1
    @AndrewGrimm I just used a web service to get examples of words ending in -ia/-ía, and then looked for suffixes in them. But at some point one has to stop, there are so many different suffixes that are only used by a few words...
    – wimi
    Feb 2, 2020 at 9:32

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