Flat

an apartment on one floor of a building.

معنی فارسی: یک واحد از ساختمان، آپارتمان

Example:

- We live in a small flat.

- a furnished/unfurnished flat

Apartment

a room or suite of rooms designed as a residence and generally located in a building occupied by more than one household.

معنی فارسی: اتاق ، یکدست اتاق ، قسمتی از عمارت

Example:

- Apartments may be owned by an owner or rented by tenants.

- When there is no tenant occupying an apartment, the apartment owner or landlord is said to have a vacancy.

- Large apartments often have two entrances, perhaps a door in the front and another in the back.

Point: The term apartment is favoured in North America, whereas the term flat is commonly, but not exclusively, used in the United Kingdom. In American English a flat is often used to mean “a flat tyre” or a puncture.