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

Several countries want to join the trilateral agreement signed in Mecca on Friday, Turkish Foreign Minister Hakan Fidan told the state-run Anadolu Agency, saying only technical matters stood in the way of them signing up. — semafor.com, 10 Aug. 2026

Turkey, Saudi Arabia and Pakistan signed a trilateral defense agreement on Friday that commits each country to jointly retaliate to any outside threat posed against any one of them. — Sara Gharaibeh, Fortune, 9 Aug. 2026

Senior leadership from Pakistan and Turkey departed for Saudi Arabia this week, where they are expected to sign a trilateral defense deal as regional violence flares. — Sophia Saifi, CNN Money, 7 Aug. 2026

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