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

Trump met with Mexican President Claudia Sheinbaum and Canadian Prime Minister Mark Carney in Washington last week following three days of hearings on the USMCA, and the leaders promised to continue the discussion about the future of the trilateral truce. —Kate Nishimura, Sourcing Journal, 11 Dec. 2025

Mexican President Claudia Sheinbaum hopes the move will lead to a reprieve of US levies on steel and aluminum, while also boosting her country’s standing ahead of next year’s revision of a trilateral trade agreement with the US and Canada. —Jeronimo Gonzalez, semafor.com, 9 Dec. 2025

Preserving this vital trilateral partnership, enhancing cooperation on economic security and restoring duty-free treatment for all USMCA-compliant goods would bolster the long-term prosperity of businesses and workers in the United States, Mexico and Canada. —Mandy Taheri, MSNBC Newsweek, 4 Dec. 2025

Britain's Prime Minister Keir Starmer arrives at a trilateral meeting with France and Germany on the sidelines of the G20 summit. —Mithil Aggarwal, NBC news, 22 Nov. 2025

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