"At square" is a term that refers to being at a point where two things intersect at a perpendicular angle, forming a perfect square. There are several synonyms for "at square" that can be used interchangeably, depending on the context. Some common synonyms include: square, right-angled, perpendicular, intersecting, and crossing. These synonyms can be used to describe the precise meeting point of two lines, the intersection of two streets, or the location of an object in relation to a square grid. No matter which synonym is used, the meaning remains the same: a point where two things meet at a perfect right angle to form a square.