ESO
Spanish, noun
ESO is spelled E-S-O (3 letters) and appears 1,413 times per million words in written Spanish, the 53rd most frequent Spanish word form (wordfreq, 2021 data). ESO is a Spanish feminine noun meaning “acronym of Educación Secundaria Obligatoria (“the Spanish secondary education system that aims to prepare students between the ages of 11…” (English Wiktionary, September 2026). In lower case, eso is a different word: “neuter singular of ése; that”.
What does ESO mean in English?
noun
- 1
Spainfeminineacronym of Educación Secundaria Obligatoria (“the Spanish secondary education system that aims to prepare students between the ages of 11 and 16 for their next studies or the world of work.”)
pronoun
- 1
neuterneuter singular of ése; that
Source: English Wiktionary, Spanish section, dump of September 2, 2026 (CC BY-SA 4.0).
How Spanish dictionaries define it
pronoun: 1. Designa genéricamente un hecho, idea u oración enunciados anteriormente.
interjection: 1. Denota picardía.
abbreviation: 1. Educación Secundaria Obligatoria.
The definition in the Spanish Wiktionary (Wikcionario), in Spanish.
Source: Spanish Wiktionary (Wikcionario), dump of September 1, 2026 (CC BY-SA 4.0), through kaikki.org.
Forms of ESO
- éste masculine proximal singular
- ése masculine medial singular
- aquél distal masculine singular
- ésta feminine proximal singular
- ésa feminine medial singular
- aquélla distal feminine singular
- esto neuter proximal singular
- aquello distal neuter singular
- éstos masculine plural proximal
- ésos masculine medial plural
- aquéllos distal masculine plural
- éstas feminine plural proximal
- ésas feminine medial plural
- aquéllas distal feminine plural
Source: English Wiktionary and Spanish Wiktionary (Wikcionario) (dumps of September 2, 2026 and September 1, 2026).
How common is ESO in Spanish?
ESO appears 1,413 times per million words in written Spanish.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).