adjective

1. of, occurring on, or affecting one side only
2. involving or obligating one only of several persons or parties; done or undertaken by one only; not reciprocal a unilateral contract
3. taking into account one side only of a matter; one-sided
4. unilineal
5. turned to one side
6. Biol. arranged or produced on one side of an axis

Etymology: ModL unilateralis: see uni- & lateral