This is the 2287th most frequent Russian word.
квадратный
Square-shaped.
Describing the shape of the object, explicitly as being square-like.
Я купил квадратный стол для кухни.
I bought a square table for the kitchen.
Denoting a metric unit of measurement, specifically of area.
Мы измерили участок площадью 100 квадратных метров.
We measured the plot with an area of 100 square meters.
Referring to the peculiar square shape of an item, adding a stylistic remark.