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symmetry

sym·me·try [ símmətree ] (plural sym·me·tries)


noun 
Definition:
 
1. property of sameness: the property of being the same or corresponding on both sides of a central dividing line

2. balanced proportions: harmony or beauty of form that results from balanced proportions

3. mathematics exact correspondence in position: a correspondence in the position of pairs of points of a geometric object that are equally positioned about a point, line, or plane that bisects the object

4. physics state of invariance: a state of invariance shown by some phenomena when changes of orientation, charge, or parity are made

[Mid-16th century. Via Latin< Greek summetria "similar measure" < metron "measure"]
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