noun, plural symmetries.
the correspondence in size, form, and arrangement of parts on opposite sides of a plane, line, or point; regularity of form or arrangement in terms of like, reciprocal, or corresponding parts.
the proper or due proportion of the parts of a body or whole to one another with regard to size and form; excellence of proportion.
beauty based on or characterized by such excellence of proportion.
a geometrical or other regularity that is possessed by a mathematical object and is characterized by the operations that leave the object invariant: A circle has rotational symmetry and reflection symmetry.
a rotation or translation of a plane figure that leaves the figure unchanged although its position may be altered.
Physics. a property of a physical system that is unaffected by certain mathematical transformations as, for example, the work done by gravity on an object, which is not affected by any change in the position from which the potential energy of the object is measured.

1535–45; < Latin symmetria < Greek symmetría commensurateness. See sym-, -metry

antisymmetry, adjective, noun
nonsymmetry, noun, plural nonsymmetries.

1. consonance, concord, correspondence. Symmetry, balance, proportion, harmony are terms used, particularly in the arts, to denote qualities based upon a correspondence or agreement, usually pleasing, among the parts of a whole. Symmetry implies either a quantitative equality of parts (the perfect symmetry of pairs of matched columns ) or a unified system of subordinate parts: the symmetry of a well-ordered musical composition. Balance implies equality of parts, often as a means of emphasis: Balance in sentences may emphasize the contrast in ideas. Proportion depends less upon equality of parts than upon that agreement among them that is determined by their relation to a whole: The dimensions of the room gave a feeling of right proportion. Harmony a technical term in music, may also suggest the pleasing quality that arises from a just ordering of parts in other forms of artistic composition: harmony of line, color, mass, phrase, ideas.

1. asymmetry. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
symmetry (ˈsɪmɪtrɪ)
n , pl -tries
1.  similarity, correspondence, or balance among systems or parts of a system
2.  maths See symmetrical an exact correspondence in position or form about a given point, line, or plane
3.  beauty or harmony of form based on a proportionate arrangement of parts
4.  physics the independence of a property with respect to direction; isotropy
[C16: from Latin symmetria, from Greek summetria proportion, from syn- + metron measure]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1563, "relation of parts, proportion," from L. symmetria, from Gk. symmetria "agreement in dimensions, due proportion, arrangement," from symmetros "having a common measure, even, proportionate," from syn- "together" + metron "meter" (see meter (2)). Meaning "harmonic arrangement
of parts" first recorded 1599. Symmetrical is recorded from 1751. Symmetrophobia is from 1809, supposed to be evident in Egyptian temples and Japanese art.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

symmetry sym·me·try (sĭm'ĭ-trē)
Exact correspondence of form and constituent configuration on opposite sides of a dividing line or plane or about a center or an axis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
symmetry   (sĭm'ĭ-trē)  Pronunciation Key 
  1. An exact matching of form and arrangement of parts on opposite sides of a boundary, such as a plane or line, or around a central point or axis.

  2. Physics See invariance.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

symmetry definition

In geometry, the equivalence, point for point, of a figure on opposite sides of a point, line, or plane.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


in biology, the repetition of the parts in an animal or plant in an orderly fashion. Specifically, symmetry refers to a correspondence of body parts, in size, shape, and relative position, on opposite sides of a dividing line or distributed around a central point or axis. With the exception of radial symmetry (see below), external form has little relation to internal anatomy, since animals of very different anatomical construction may have the same type of symmetry

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The art would be having the eye that observes carefully and you can see balance
  and symmetry, shape and form.
Other deep issues include space-time symmetry and whether there are extra
Neither of these reasons explain why there is symmetry in a spiderweb.
But to those who ponder the sun's tremendous energy, there's a perfect symmetry
  in the idea of solar cooling.
Images for symmetry
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