# symmetrical

### or symmetric

[si-me-tri-kuh l] /sɪˈmɛ trɪ kəl/
1.
characterized by or exhibiting symmetry; well-proportioned, as a body or whole; regular in form or arrangement of corresponding parts.
2.
Geometry.
1. noting two points in a plane such that the line segment joining the points is bisected by an axis:
Points (1, 1) and (1, −1) are symmetrical with respect to the x-axis.
2. noting a set consisting of pairs of points having this relation with respect to the same axis.
3. noting two points in a plane such that the line segment joining the points is bisected by a point or center:
The points (1, 1) and (−1, −1) are symmetrical with respect to (0, 0).
4. noting a set consisting of pairs of points having this relation with respect to the same center.
3.
Often, symmetric. Mathematics.
1. noting a square matrix that is equal to its transpose.
2. noting a dyad or dyadic that is equal to its conjugate.
3. noting a relation in which one element in relation to a second implies the second in relation to the first.
4.
Botany.
1. divisible into two similar parts by more than one plane passing through the center; actinomorphic.
2. (of a flower) having the same number of parts in each whorl.
5.
Chemistry.
1. having a structure that exhibits a regular repeated pattern of the component parts.
2. noting a benzene derivative in which three substitutions have occurred at alternate carbon atoms.
6.
affecting corresponding parts simultaneously, as certain diseases.
Origin of symmetrical
1745-1755
1745-55; symmetr(y) + -ical
Related forms
symmetricalness, noun
Synonyms
1. balanced, orderly, regular, congruent.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for symmetrical
Contemporary Examples
• All of them are beautiful and sexy by agreed standards (fit, slender yet shapely, big eyes, symmetrical features).

January 31, 2010
• It has the swooping, symmetrical grace of a bird's wingspan.

• Yes, Israel has nukes, and that technology has made Israel safe from symmetrical attack.

• This means closely examining photos for sought-after traits like height and a symmetrical face.

August 14, 2014
• It takes Sharp four hours to get into character: “I take joy in the mathematical, symmetrical precision and perfectness of Bach.”

December 6, 2014
Historical Examples
• He substituted musical declamation of a very highly-developed order for the rhythmic melody and symmetrical movements of opera.

Florence May
• The symmetrical and graceful body must express something of it.

Charles A. Eastman
• It is rare to find in the polyp a regular, symmetrical disposition of the tentacles as in the medusa.

• Our symmetrical growth is the measure of our success as human beings.

Kenyon L. Butterfield
• This symmetry is expressed by the symmetrical geometrical relations of the line to the family of planes normal to it.

British Dictionary definitions for symmetrical

## symmetrical

/sɪˈmɛtrɪkəl/
1.
possessing or displaying symmetry Compare asymmetric
2.
(maths)
1. (of two points) capable of being joined by a line that is bisected by a given point or bisected perpendicularly by a given line or plane: the points (x, y) and (–x, –y) are symmetrical about the origin
2. (of a configuration) having pairs of points that are symmetrical about a given point, line, or plane: a circle is symmetrical about a diameter
3. (of an equation or function of two or more variables) remaining unchanged in form after an interchange of two variables: x + y = z is a symmetrical equation
3.
(chem) (of a compound) having a molecular structure in which substituents are symmetrical about the molecule
4.
(botany) another word for isomerous
5.
Also symmetric. (of a disease, infection, etc) affecting both sides of the body or corresponding parts, such as both legs
Derived Forms
symmetricalness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for symmetrical

1570s (implied in symmetrically), from symmetry + -ical.

Online Etymology Dictionary, © 2010 Douglas Harper
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symmetrical in Science
 symmetric (sĭ-mět'rĭk) or symmetrical   (sĭ-mět'rĭk)    Relating to or exhibiting symmetry.Relating to a logical or mathematical relation between two elements such that if the first element is related to the second element, the second element is related in like manner to the first. The relation a = b is symmetric, whereas the relation a > b is not.
The American Heritage® Science Dictionary
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### Difficulty index for symmetrical

Few English speakers likely know this word

### Word Value for symmetrical

20
23
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