a part of a structure having some specific characteristic or function
"the spacious cooking area provided plenty of room for servants"
the extent of a 2-dimensional surface enclosed within a boundary
"the area of a rectangle"
"it was about 500 square feet in area"
A measure of the extent of a surface; it is measured in square units.
"The area of the rectangular garden was calculated to be exactly 50 square meters after multiplying its length by its width."
In plain English: An area is a specific part of a space defined by its boundaries.
"The quiet area in the park is perfect for reading a book."
Usage: Use "area" to refer to a specific region or part of a larger space, such as a city district or a section of a room. Do not use it to mean the mathematical measurement of surface size unless you are specifically discussing geometry.
The word area is a learned borrowing from Latin, where it originally meant a paved surface or courtyard.