1. (a.) Having two sides; affecting two sides or two parties; as, a bilateral negotiation\.

2. (a.) of or pertaining to the two sides of a central area or organ, or of a central axis; as, bilateral symmetry in animals, where there is a similarity of parts on the right and left sides of the body.

Janus-like ambidextrous bifacial bifold biform bifurcated binary binate biparous bipartisan bipartite bivalent conduplicate dichotomous dihedral disomatous double double-faced duadic dual dualistic duple duplex duplicate duplicated dyadic flanked geminate geminated handed identical lateral many-sided matched multilateral one-sided polyhedral quadrilateral second secondary sided tetrahedral three-sided trihedral trilateral triquetrous twain twin twinned two two-faced two-level two-ply two-sided two-story twofold unilateral