Define is a little command-line dictionary that contains words in over 50 languages, and is always up-to-date.
Define retrieves all its word and phrase definitions from the respective Wiktionary for the language queried, e.g. http://en.wiktionary.org.
go get github.com/patrickmn/define
./define fishing ./define -l da fiske
Run define without any arguments for details, and “define languages” for a list of the supported languages.