having several or many sides; many-sided.
participated in by more than two nations, parties, etc.; multipartite: multilateral agreements on disarmament.

1690–1700; multi- + lateral

multilateralism, noun
multilateralist, adjective, noun
multilaterally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
multilateral (ˌmʌltɪˈlætərəl, -ˈlætrəl)
1.  of or involving more than two nations or parties: a multilateral pact
2.  having many sides

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1690s, "having many sides," from multi- + L. latus (gen. lateris) "side" (see oblate (n.)). Meaning "pertaining to three or more countries" is from 1802. Multilateralism is first recorded 1928.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Foundations, for example, usually cover the start-up costs of a multilateral
  program but don't want to be long-term supporters.
Model education, social, and environment programs are underway with support
  from multilateral development organizations.
As a result, the report notes, more avenues for multilateral research
  collaboration are opening up.
It's obvious that conservation takes a backseat to political and economic
  influences when dealing with multilateral agreements.
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