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.

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.

Source: Webster's Revised Unabridged Dictionary (1913)