bilateral

Short definition from Wiktionary

Adjective

1. 1
   Having two sides.
2. 2
   Involving both sides equally.
3. 3
   Binding on both of the two parties involved.
4. 4
   Having bilateral symmetry.
5. 5
   Involving descent or ascent regardless of sex and side of the family (bilateral linearity).

Noun

1. 1
   A meeting between two people or groups.