the advocacy or pursuit of a unilateral policy, especially in disarmament.

1925–30; unilateral + -ism

unilateralist, noun, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unilateral (ˌjuːnɪˈlætərəl)
1.  of, having, affecting, or occurring on only one side
2.  involving or performed by only one party of several: unilateral disarmament
3.  law (of contracts, obligations, etc) made by, affecting, or binding one party only and not involving the other party in reciprocal obligations
4.  botany having or designating parts situated or turned to one side of an axis
5.  sociol Compare bilateral relating to or tracing the line of descent through ancestors of one sex only
6.  phonetics denoting an (l) sound produced on one side of the tongue only

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Cultural Dictionary
unilateralism [(yooh-nuh-lat-uhr-uh-liz-uhm)]

Action initiated or taken by a single nation rather than by two nations (see bilateralism) or several (see multilateralism). For example, a nation might choose to disarm unilaterally in the hope that others will follow. (See recognition.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Arrogant and uninformed unilateralism in foreign policy.
The arrogance and unilateralism of the last few years helped create this situation.
The isolationist impulse has risen from the grave, and it has taken the new form of unilateralism.
The second false choice is between unilateralism and multilateralism.
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