Growing up on the West Coast, we consistently used breakfast, lunch, and dinner. My aunt, who seems to be a little more entrenched in her Midwestern roots, always refers to the evening meal as supper, and that *still* seems to be the deal here in the Midwest.

Another variation, relative to times of day - breakfast is the early morning meal, but if it stretches too close to noon, it becomes brunch (also used for fancy buffet-type affairs on certain holidays - Mothers' Day and Easter pop to mind). And on a lazy Sunday, if my roommate and I haven't pulled ourselves together well during the day, the main meal sometimes happens around the traditional tea time - 3 or 4 - and we've coined lupper to describe that phenomenon.