People use the words dinner, lunch, supper and tea in different ways depending on which English-speaking country they come from. In Britain it may also depend on which part of the country or which social class a person comes from.
A meal eaten in the middle of the day is usually called lunch. If it is the main meal of the day it may also be called dinner in BrE, especially in the north of the country.
A main meal eaten in the evening is usually called dinner, especially if it is a formal meal. Supper is also an evening meal, but more informal than dinner and usually eaten at home. It can also be a late meal or something to eat and drink before going to bed.
In BrE, tea is a light meal in the afternoon with sandwiches, cakes, etc. and a cup of tea.
a cream tea
奶油茶点
It can also be a main meal eaten early in the evening, especially by children.
What time do the kids have their tea?
孩子们什么时候用傍晚主餐？
As a general rule, if dinner is the word someone uses for the meal in the middle of the day, they probably call the meal in the evening tea or supper. If they call the meal in the middle of the day lunch, they probably call the meal in the evening dinner.
Brunch, a combination of breakfast and lunch, is becoming more common, especially as a meal where your guests serve themselves.
breakfast
/ˈbrekfəst/
the meal you have in the morning
lunch
/lʌntʃ/
a meal eaten in the middle of the day
What shall we have for lunch?
我们午餐吃什么？
dinner
/ˈdɪnər/
the main meal of the day, eaten in the middle of the day or the evening
brunch
/brʌntʃ/
a meal eaten in the late morning, as a combination of breakfast and lunch
早午餐（早午两餐并作一餐）
tea
/tiː/
a small meal of cake or biscuits eaten in the afternoon with a cup of tea
下午茶，午后茶点
