bilateral symmetry

n.
Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane.

n.

Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane.

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The noun has one meaning:

Meaning #1: the property of being symmetrical about a vertical plane
  Synonyms: bilaterality, bilateralism

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