wikid is a quick and simple CLI-program for downloading and rendering wikipedia pages in your terminal. And it's not wikid as in wiki daemon, but as in wicked, Strikingly good, and effective.
wikid uses the curl library to download the wiki pages, and ncurses for retrieving the terminal width for line output.
Edit config.mk to match your local setup (wikid is installed into the /usr/local namespace by default), then simply enter the following command to install (if necessary as root):
make clean install
Read about wikipedia, using less
wikid wikipedia | less
Read about wikipedia in german, using less
wikid -lde wikipedia | less