U′ni‐lat″er‐al (?), a. [Uni- + lateral: cf. F. unilatéral.] 1. Being on one side only; affecting but one side; one-sided.
2. (Biol.) Pertaining to one side; one-sided; as, a unilateral raceme, in which the flowers grow only on one side of a common axis, or are all turned to one side.
Unilateral contract(Law), a contract or engagement requiring future action only by one party.