A measure of spatial extent, especially width, height, or length. Extent or magnitude; scope. Often used in the plural: a problem of alarming dimensions. Aspect; element: "He's a good newsman, and he has that extra dimension\u201d ( William S. Paley). Mathematics The least number of independent coordinates required to specify uniquely the points in a space. Mathematics The range of such a coordinate. Physics A physical property, such as mass, length, time, or a combination thereof, regarded as a fundamental measure or as one of a set of fundamental measures of a physical quantity: Velocity has the dimensions of length divided by time. To cut or shape to specified dimensions. To mark with specified dimensions.