Longman Dictionary of Contemporary English homepage

unilateral

 adjective
     
Related topics: Government
u‧ni‧lat‧e‧ral formal
PG 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
Definition from the Longman Dictionary of Contemporary English
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