Anxiety Disorder Statistics. Anxiety Disorders affect 18.1 percent of adults in the United States (approximately 40 million adults between the ages of 18 to 54).
Perfect square. Perfect square is an element of algebraic structure which is equal to the square of another element. Square number, a perfect square integer.
square noun [ C ] (SHAPE) âº geometry a flat shape with four sides of equal length and four angles of 90Â°, or an area or object having this shape. square noun [ C ] (PLACE) âº a small area of open land in a city or town, often one in the shape of a square.