Dinner:
* The most common and widely accepted term for the main meal of the day. This applies in most parts of the US, Canada, and the UK.
* Usually eaten in the evening.
* Can be used for any meal, regardless of the time of day. For example, "We're having dinner at noon."
Supper:
* More common in some regions of the US, especially in the South and Midwest.
* Often used for a meal eaten later in the evening than "dinner."
* Can also refer to a lighter or simpler meal than dinner. For example, "We had a quick supper before going to the movies."
Key Differences:
* Time of day: "Dinner" is generally associated with the evening, while "supper" can be eaten later.
* Region: "Supper" is more common in some regions than others.
* Meal size: "Dinner" often implies a more substantial meal than "supper."
Tips:
* If in doubt, use "dinner." It's the most universally understood term.
* Pay attention to local customs. If you're visiting a new region, observe how people refer to their evening meal.
* Be mindful of context. If you're talking about a simple meal, "supper" might be appropriate.
Ultimately, the choice between "supper" and "dinner" is largely a matter of personal preference and regional custom. As long as you're clear and consistent in your usage, you'll be understood.