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 Line of Symmetry:  A line that divides a figure into two parts, each of which is a mirror image of the other.

Symmetry at ThinkQuest.org: Read another definition of symmetry, and see examples of symmetry in everyday life.

Harcourt's Interactive Math Glossary: See animated definition of line of symmetry.

Harcourt's Interactive Math Glossary: See animated definition of line symmetry.

Line of Symmetry: Read more about lines of symmetry and line symmetry.

Line-of-Symmetry: Read another definition of line of symmetry.