The word meal means any time when you eat a large amount of food. There are
typically 3 meals per day – breakfast (in the morning), lunch (mid-day), and dinner
(at night). A snack is a smaller amount of food (for example, a bag of chips or a piece
of fruit) and you can eat a snack anytime.
In American English, dinner and supper are the same – both are used to describe
the evening meal. However, in some cultures, the word supper is used for a light
meal served in early evening, and dinner may be later in the night.