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symmetry

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. Exact correspondence of form and constituent configuration on opposite sides of a dividing line or plane or about a center or an axis. See Synonyms at proportion.
• n. A relationship of characteristic correspondence, equivalence, or identity among constituents of an entity or between different entities: the narrative symmetry of the novel.
• n. Beauty as a result of balance or harmonious arrangement.

• n. Exact correspondence on either side of a dividing line, plane, center or axis.
• n. The satisfying arrangement of a balanced distribution of the elements of a whole.

from the GNU version of the Collaborative International Dictionary of English

• n. 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.
• n. 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.
• n.
• n. Equality in the number of parts of the successive circles in a flower.
• n. Likeness in the form and size of floral organs of the same kind; regularity.

from The Century Dictionary and Cyclopedia

• n. Proportionality; commensurability; the due proportion of parts; especially, the proper commensurability of the parts of the human body, according to a canon; hence, congruity; beauty of form.
• n. The metrical correspondence of parts with reference to a median plane, each element of geometrical form having its counterpart upon the opposite side of that plane, in the same continued perpendicular to the plane, and at the same distance from it, so that the two halves are geometrically related as a body and its image in a plane mirror: so, usually, in geometry.
• n. The composition of like and equably distributed parts to form a unitary whole; a balance between different parts, otherwise than in reference to a medial plane: but the mere repetition of parts, as in a pattern, is not properly called symmetry.
• n. Consistency; congruity; keeping; proper subordination of a part to the whole.
• n. In biology: In botany, specifically, agreement in number of parts among the cycles of organs which compose a flower. See symmetrical, 3.
• n. In zoölogy and anatomy, the symmetrical disposition or reversed repetition of parts around an axis or on opposite sides of any plane of the body.
• n. In moderu crystallography crystals are not only referred to certain systems (see crystallography) according to the relative lengths and inclinations of their assumed axes, but they are also further divided into classes, or groups, according to the kind and number of symmetry elements they possess.
• n. In Radial series, the Major Symmetry is built up by radial divisions of the first kind, producing segments whose adjacent parts are homologous, and related to each other as images.

• n. (physics) the property of being isotropic; having the same value when measured in different directions
• n. (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane
• n. balance among the parts of something

Etymologies

Latin symmetria, from Greek summetriā, from summetros, of like measure : sun-, syn- + metron, measure.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin symmetria, from Ancient Greek συμμετρία (symmetria), from σύμμετρος (summetros, "symmetrical"), from σύν (sun, "with") + μέτρον (metron, "measure"). (Wiktionary)