symmetry

noun (plural symmetries)

• the quality of being made up of exactly similar parts facing each other or around an axis:this series has a line of symmetry through its center a crystal structure with hexagonal symmetry
• correct or pleasing proportion of the parts of a thing:an overall symmetry making the poem pleasant to the ear
• similarity or exact correspondence between different things:a lack of symmetry between men and women history sometimes exhibits weird symmetries between events
• Physics & Mathematics a law or operation in which a physical property or process has an equivalence in two or more directions.