Other forms: symmetries
Symmetry is the quality of matching exactly on both sides. Perfect symmetry, a line of symmetry, break the symmetry.
The main kinds are reflection, where one half mirrors the other, rotation, where the shape repeats as it turns, and translation, where a pattern repeats along a line. In physics, symmetries correspond to conservation laws — that is Noether's theorem, and it is one of the deepest results in the subject. Note symmetrical; asymmetry; and that human faces are never quite symmetrical, which is what makes them faces.
1nounsymmetryThe quality of matching exactly on both sides.
“The butterfly's wings have perfect symmetry, with matching spots on each side.”
symmetry is a matching correspondence.
Greek symmetria means measured together — syn plus metron, a measure. To the Greeks it meant right proportion generally, and the modern mirror sense is a narrowing.
Ancient Greek
συμμετρία
Latin
symmetria
English, today
symmetry
Built from
From Latin symmetria, from Ancient Greek συμμετρία, from σύμμετρος (“symmetrical”), from σύν (“with”) + μέτρον (“measure”). by surface analysis, sym- + -metry.
Etymology from Wiktionary, CC BY-SA