1 performed by or affecting only one person or party (unilateral disarmament; unilateral declaration of independence).
2 one-sided.
3 (of the parking of vehicles) restricted to one side of the street.
4 (of leaves) all on the same side of the stem.
5 (of a line of descent) through ancestors of one sex only.
Derivatives:
unilaterally adv.
Useful english dictionary. 2012.