This thread is for the site lexicon, you can post if you think that it's on topic but it's not created for a big discussion.
What is dl? Dl is short for Deciliter and a way to measure volume.
1 dl is
In other measuring systems 1 dl is
0,42 US cups
1,11 Uk quarts
or 1 dl is
or 6,67 tablespoons
If I have missed something (I use metrics so I don't know them all) there is a converter here.