trilateral

adjective

tri·​lat·​er·​al (ˌ)trī-ˈla-tə-rəl 

-ˈla-trəl

: having three sides or parties

trilateral business ventures

trilateral discussions

Examples of trilateral in a Sentence

Recent Examples on the Web

Jarvis also highlighted cooperation with the United States and Australia under the trilateral AUKUS partnership. — Neetika Walter, Interesting Engineering, 8 July 2026

The tension also comes as the three countries approach a July 1 deadline to review their trilateral trade agreement. — Whitney Eulich, Christian Science Monitor, 29 June 2026

Representatives from the United States, Israel, and Lebanon signed a trilateral framework following lengthy negotiations aimed at ending the conflict and laying out the groundwork for a future peace agreement. — Rena Rowe, The Washington Examiner, 26 June 2026

Sean Gallup/Getty The last time Russian and Ukrainian representatives met face to face was in February in the United Arab Emirates during trilateral summits mediated by the United States. — Aidan Stretch, CBS News, 25 June 2026

Word History

Etymology

Latin trilaterus, from tri- + later-, latus side

First Known Use

1660, in the meaning defined above

Rhymes for trilateral

• bilateral
• collateral
• anterolateral
• posterolateral
• basolateral
• contralateral
• dorsolateral
• equilateral
• ipsilateral
• multilateral
• quadrilateral
• unilateral

Kids Definition

trilateral

adjective

tri·​lat·​er·​al (ˈ)trī-ˈlat-ə-rəl 

-ˈla-trəl

: having three sides