Unilateral /(?)/

U·ni·lat·er·al

Unilateral

a.
  1. Being on one side only; affecting but one side; one-sided.
  2. 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. (Biol.)

Phrases & Compounds
Unilateral contract
a contract or engagement requiring future action only by one party.