a. [ Uni- + lateral: cf. F. unilatéral. ] 1. Being on one side only; affecting but one side; one-sided. [ 1913 Webster ]
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. [ 1913 Webster ]
Unilateral contract (Law), a contract or engagement requiring future action only by one party. [ 1913 Webster ]