adj.1. Of, on, relating to, involving, or affecting only one side: "a unilateral advantage in defense" (New Republic).
2. Performed or undertaken by only one side: unilateral disarmament.
3. Obligating only one of two or more parties, nations, or persons, as a contract or an agreement.
4. Emphasizing or recognizing only one side of a subject.
5. Having only one side.
6. Tracing the lineage of one parent only: a unilateral genealogy.
7. Botany Having leaves, flowers, or other parts on one side only.