Dictionary
Official Esperanto roots: Fundamento and Official Additions
Which Esperanto roots are official? 5,328 roots in eleven layers, from the Fundamento of 1905 to the 10th Official Addition of 2023.
How the official vocabulary grew
The Reta Vortaro marks 5,328 roots as official: 2,756 from the Fundamento (1905), 2,569 added in ten Official Additions from 1909 to 2023, and 3 by separate decisions of the Academy.
Naŭa Oficiala Aldono (9OA) 2007
208new roots
4,905in total
Pick a layer to see words that entered the language then.
Official status of roots: Reta Vortaro's markings; years: Akademio de Esperanto; word order: frequency in Tatoeba.
| Layer | Year | Roots |
|---|---|---|
| Fundamento de Esperanto | 1905 | 2,756 |
| Unua Oficiala Aldono (1OA) | 1909 | 805 |
| Dua Oficiala Aldono (2OA) | 1919 | 586 |
| Tria Oficiala Aldono (3OA) | 1921 | 186 |
| Kvara Oficiala Aldono (4OA) | 1929 | 118 |
| Kvina Oficiala Aldono (5OA) | 1934 | 8 |
| Sesa Oficiala Aldono (6OA) | 1935 | 21 |
| Sepa Oficiala Aldono (7OA) | 1958 | 30 |
| Oka Oficiala Aldono (8OA) | 1974 | 187 |
| Naŭa Oficiala Aldono (9OA) | 2007 | 208 |
| Deka Oficiala Aldono (10OA) | 2023 | 420 |
Single Academy decisions
- analog- (1923)
- mis- (1929)
- end- (1953)
Counts follow the officiality marks in Reta Vortaro (ReVo); the Academy of Esperanto keeps the official list in its Akademia Vortaro, and its own counts differ by a few roots. Words built from official roots are normal Esperanto even when they are not on any list: see Word building. Academy.