trilateral
Word family nountrilateralismtrilateralisttrilaterationadverbtrilaterallyadjectivetrilateral
tri·lat·e·ral /traɪˈlætərəl/ adjectiveadj [only before noun] involving three groups, countries etc 涉及三方的,涉及三个国家的 → bilateral trilateral peace talks 三边和平谈判