We may have used the word dinner on Sundays, when we had our big meal sometime after church. It wasn't lunch or supper, so maybe it was dinner. Then I think we had a light supper of soup and sandwiches later on.

I just looked up the difference and apparently dinner means a big, full meal, whether eaten at noon or in the evening. If you had a sandwich for lunch, you probably follow it up with dinner, and if you had a big dinner at noon, you follow up with a light supper in the evening.

Supposedly. :-)