The word "most equal-sided" refers to something that has sides of equal length and/or equal angles. Some synonyms for this phrase include "regular," "symmetrical," and "equilateral." A regular polygon, for example, has sides and angles that are all equal. A symmetrical shape, such as a square or a circle, also has equal sides and angles. Furthermore, an equilateral triangle has three sides of equal length and three angles that are each 60 degrees. These synonyms not only describe the geometric qualities of shapes, but they can also be used to describe more abstract concepts, such as balance and fairness.