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From The Collaborative International Dictionary of English v.0.48:
Unilateral \U`ni*lat"er*al\, a. [Uni- + lateral: cf. F. unilat['e]ral.] 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]