SYMMETRY

isotropy, symmetry

(noun) (physics) the property of being isotropic; having the same value when measured in different directions

symmetry, symmetricalness, correspondence, balance

(noun) (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane

symmetry, proportion

(noun) balance among the parts of something

Source: WordNet® 3.1

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Etymology

Noun

symmetry (countable and uncountable, plural symmetries)

Exact correspondence on either side of a dividing line, plane, center or axis.

The satisfying arrangement of a balanced distribution of the elements of a whole.

Source: Wiktionary

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Sym"me*try, n. Etym: [L. symmetria, Gr. symétrie. See Syn-, and Meter rhythm.]

1. A due proportion of the several parts of a body to each other; adaptation of the form or dimensions of the several parts of a thing to each other; the union and conformity of the members of a work to the whole.

2. (Biol.)

Definition: The law of likeness; similarity of structure; regularity in form and arrangement; orderly and similar distribution of parts, such that an animal may be divided into parts which are structurally symmetrical.

Note: Bilateral symmetry, or two-sidedness, in vertebrates, etc., is that in which the body can be divided into symmetrical halves by a vertical plane passing through the middle; radial symmetry, as in echinoderms, is that in which the individual parts are arranged symmetrically around a central axis; serial symmetry, or zonal symmetry, as in earthworms, is that in which the segments or metameres of the body are disposed in a zonal manner one after the other in a longitudinal axis. This last is sometimes called metamerism.

3. (Bot.) (a) Equality in the number of parts of the successive circles in a flower. (b) Likeness in the form and size of floral organs of the same kind; regularity. Axis of symmetry. (Geom.) See under Axis.

– Respective symmetry, that disposition of parts in which only the opposite sides are equal to each other.

Source: Webster’s Unabridged Dictionary 1913 Edition

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