Europe use flat. US and Canada use apartment. For example: apple, 蘋果.. "Apple" is written in English and 蘋果 is written in Chinese. Eventhough these two words are difference. But the concept of the object is the same.

@romulus how can d same thing have different descriptions?? if they are d same, they should have the same description, right?

the same thing...... different description. :)

nothing.

The difference between '...a flat and an apartment...' are a few thousand km. apartment: American English flat: British English other words (seldom used) are: tenement, residence, lodging, dwelling, habitation