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# symmetry

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noun sym·me·try \ˈsi-mə-trē\

## Simple Definition of symmetry

• : the quality of something that has two sides or halves that are the same or very close in size, shape, and position : the quality of having symmetrical parts

Source: Merriam-Webster's Learner's Dictionary

plural

## symmetries

1. 1 :  balanced proportions; also :  beauty of form arising from balanced proportions

2. 2 :  the property of being symmetrical; especially :  correspondence in size, shape, and relative position of parts on opposite sides of a dividing line or median plane or about a center or axis — compare bilateral symmetry, radial symmetry

3. 3 :  a rigid motion of a geometric figure that determines a one-to-one mapping onto itself

4. 4 :  the property of remaining invariant under certain changes (as of orientation in space, of the sign of the electric charge, of parity, or of the direction of time flow) —used of physical phenomena and of equations describing them

## Examples of symmetry in a sentence

1. the symmetry of the human body

2. The building has perfect symmetry.

## Origin and Etymology of symmetry

Latin symmetria, from Greek, from symmetros symmetrical, from syn- + metron measure — more at measure

First Known Use: 1563

## symmetry

play
noun sym·me·try \ˈsi-mə-trē\

plural

## symmetries

1. :  close agreement in size, shape, and position of parts that are on opposite sides of a dividing line or center :  an arrangement involving regular and balanced proportions <the symmetry of the human body>

## symmetry

play
noun sym·me·try \ˈsim-ə-trē\

plural

## symmetries

1. 1:  correspondence in size, shape, and relative position of parts on opposite sides of a dividing line or median plane or about a center or axis—see bilateral symmetry, radial symmetry

2. 2:  the property of remaining invariant under certain changes (as of orientation in space, of the sign of the electric charge, of parity, or of the direction of time flow)—used of physical phenomena and of equations describing them

## Seen and Heard

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a very small amount

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