For most Germans, Mittagessen is still the main meal of the day. Abendbrot or Abendessen normally consists of bread, cheese, meats, perhaps a salad, and a hot drink. It is eaten by the whole family at about 6 or 7 p.m.
Abendessen can also refer to a cooked meal, especially for people who are out at work all day.
Source: Oxford German Colour Dictionary