Bona vortaro

Bona vortaro is an Esperanto dictionary for Android. It contains the whole Reta Vortaro (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).
• The most used translation first: "deviner" gives "diveni" before "duonkompreni"; rare or advised-against words after the others.
• Read clear articles: definitions, examples, remarks, links between words, and the translations in your languages, the examples' too.
• 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".
• Meet a word that isn't in the dictionary? The search suggests the roots and affixes it may be built from: "malsanulejestrano" = malsanulej + estr + ano.
• More French translations: thousands of French words that Reta Vortaro lacks, from the French Wiktionary, with a dotted underline in the articles.
• Definitions from the Esperanto Wiktionary for hundreds of words that Reta Vortaro lacks.
• Words advised against by "Vortoj de la bona lingvo" (labonalingvo.org), with what to say instead: "eskalatoro", preferably "rulŝtuparo".
• The origins of the words, if you turn them on: "akvo", from Italian "acqua", Latin "aqua" (Rajki's etymological dictionary, Wiktionary).
• After each example, the work it comes from; icons for the fields.
• 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.