This is a completely new version of the Esperanto dictionary, with far more words than the previous one. Because there are so many words, it has now been divided alphabetically -- there is an index at the top of each page so that you can easily navigate around it.
The dictionary is largely derived from the vocabulary in Ivy Kellerman Reed's Complete Grammar of Esperanto, which is in the public domain. You can download the complete work from Project Gutenberg if you are interested.
If you are unfamiliar with Esperanto, or want a quick reminder, click here for a brief run down of the basics of Esperanto grammar.