Definition of trilateral adjective from the Oxford Advanced Learner's Dictionary

 

trilateral

 adjective
adjective
BrE BrE//ˌtraɪˈlætərəl//
 
; NAmE NAmE//ˌtraɪˈlætərəl//
 
 
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involving three groups of people or three countries trilateral talks compare bilateral, multilateral, unilateral
See the Oxford Advanced American Dictionary entry: trilateral