Bona vortaro is an Esperanto dictionary for Android. It contains the whole <a href="https://reta-vortaro.de/">Reta Vortaro</a> (ReVo), the free Esperanto dictionary, with its translations into more than 170 languages, and works without Internet access. • Search in Esperanto and in your other languages, with or without accents (cx → ĉ), and with wildcards (*ologio). • Read clear articles: definitions, examples, remarks, links between words, and the translations in your languages. • See which words are official (Fundamento, Official Additions), and browse the list of each Addition. • Long-press a word to look it up, whatever its form: "arbojn" finds "arbo". • Leaf through the dictionary from root to root, or discover a random root. • Your recent searches, day and night colours, text size. The app's interface is in Esperanto. You can search, and read the translations, in any of the dictionary's 170+ languages. The name is a tribute to "La bona lingvo" by Claude Piron. Bona vortaro is based on PReVo by Neil Roberts.