User blog comment:Saratje/PC release date explained - Skyrim: Dragonborn DLC/@comment-5469467-20121123211511/@comment-66.87.4.87-20121203110556

^^^Exactly, Bethesda should have explained what they meant by DLC. If they meant expansions, then should have said so, but DLC isn't only large content. And a content add-on and expansion pack really can't be that different. Dawnguard and Heathfire are all of these things. They all were downloadable content, because you pay to download them. They were all expansions because they expaned the vanilla game. And they were all add-on content because, like an expansion, they added new content to the game.

Bethesda can't give new meanings to these terms, because they all mean the same thing and have nothing to do with their size. Maybe a name like "small" and "large" would be more clear then 3 different terms with synonymous techinical meanings.