What does multilateral mean?
Multilateral describes something involving more than two parties, especially in international relations, diplomacy, economics, and law. Multilateral negotiations, agreements, sanctions, and institutions bring several countries or organizations into a shared process rather than leaving each state to act alone. The term is especially associated with diplomacy, where it contrasts with a bilateral agreement between two parties and a unilateral action taken by one. In geometry, a multilateral polygon has more than three sides, although this technical use is comparatively uncommon. Its meaning carries a mild connotation of collective action, negotiation, and institutional cooperation, though it does not necessarily imply that the participating parties agree. The related noun multilateralism denotes support for or the practice of such many-party arrangements, while multilaterally describes something done through cooperation among several participants.
adjectiveInvolving more than two countries, organizations, or parties. In geometry, a multilateral polygon has more than three sides.
- Involving or conducted by more than two countries, organizations, or parties.
- In geometry, having more than three sides.
"The diplomats resumed multilateral negotiations on climate change."
"The summit produced a multilateral commitment to reduce emissions."
"The polygon is described as multilateral because it has five sides."
Multilateral literally evokes a shape with many sides, and the word carries that same idea into diplomacy: a decision made by many parties rather than one.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does multilateral come from?
Multilateral was formed in the 19th century from the Latin-derived combining form multi-, meaning “many,” and lateral, meaning “of or relating to a side.” Its development reflects the earlier Latin multus (“many” or “much”) and latus (“side”). The same roots appear in cognates such as multiple, bilateral, unilateral, and lateral.
Related word forms
How multilateral is actually used
The diplomatic sense is by far the most common. In general usage, the word often contrasts with bilateral or unilateral arrangements. The geometrical sense is established but much less frequent.
Easily confused with multilateral
A bilateral agreement involves two parties, whereas a multilateral agreement involves more than two.
Multilateral describes the participation of multiple parties, while multinational more commonly describes an organization that operates across several countries.