Shopping & Style6 mins ago
School Meals
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For more on marking an answer as the "Best Answer", please visit our FAQ.One cannot hope to explain the differences better than simply by quoting what The Oxford English Dictionary says about 'dinner'...
"The chief meal of the day, eaten originally and still by the majority of people about the middle of the day, but now, by the professional and fashionable classes, usually in the evening."
It is clear, therefore, that it is a matter entirely of class and - as Nicola said above - geography.
Somewhere on this site, it was mentioned that '"tea" is a working class term for what upper classes call "dinner".
Someone else mentioned that it ties in with factory workers who used to come home early in the evening when factories shut down and then had an early "dinner" that they called "tea". How far this is true, I don't know.