Meaning of “unilateral” - Learner’s Dictionary

unilateral

adjective uk us /ˌjuːnɪˈlætərəl/

A unilateral action or decision is done or made by one country, group, etc without waiting for others to agree:

unilateral nuclear disarmament
unilaterally adverb

(Definition of “unilateral” from the Cambridge Learner’s Dictionary © Cambridge University Press)