What is the German meaning of blitz?

The German word for "blitz" is Blitz. It's the same word in German, but pronounced with a "ts" sound at the end.

However, in German, "Blitz" usually refers to lightning.

If you're looking for the German word for a "blitz attack" (like the German air raids on Britain during World War II), you would use Blitzkrieg, which literally translates to "lightning war".