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 Axis of Symmetry:  A line that a figure can be folded over so that one-half of the figure matches the other half perfectly; a line about which a figure is symmetrical.

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.