I think the question is how does this compare/contrast with the dict command, a common utility that uses the Dictionary Server Protocol to query dictionaries from the command line.
Getting a definition or spelling correction for a word or a list of synonyms and antonyms, maybe a brief etymology, without interrupting my workflow at the command line or opening a slow heavy program like a web browser or office suite.
Wow, thanks alot for the feedback. To be honest, I didn't know the 'dict' command prior to your reply (what a shame lol). It is true that 'dict' is much more lightweight and robust, but since I myself is ESL, this was initially aimed at ESL-people, so I added some features to help them learn English.