Words like 'campaign', 'system', 'dX', etc. Is there a good web resource with them all on a single page?
The best way to learn the meanings of RPG terminology is from the introduction to the specific gaming book you're reading at the time
However, there are some useful glossaries on the web that cover industry-wide terms. Be advised that there are few standards and some games play fast and lose with established practice:
- http://www.theescapist.com/faq_terms.htm Has a brief, but illustrated glossary.
- http://www.boardgamegeek.com/wiki/page/RPG_Glossary is a longer glossary.
The original comprehensive list was the venerable RPG Glossary that was hosted at the now-defunct Treasure Tables blog. Fortunately, it's been archived in the Wayback Machine:
Several other sites have roleplaying glossaries that might eventually usurp the RPG Glossary: