u ‧ ni ‧ lat ‧ e ‧ ral /ˌjuːnəˈlæt ə rəl◂, ˌjuːnɪˈlæt ə rəl◂/ BrE AmE adjective formal
a unilateral action or decision is done by only one of the groups involved in a situation ⇨ bilateral , multilateral :
a unilateral declaration of independence
unilateral disarmament (=when one country gets rid of its own ↑ nuclear weapons without waiting for other countries to do the same)
—unilateralism noun [uncountable]
—unilaterally adverb