1650s, from Late Latin trilaterus "three-sided;" see tri- + lateral. The Trilateral Commission (representing Japan, the U.S., and Europe) was founded 1973. Related: Trilateralism; trilaterally.
trilateral talks
a trilateral figure
trigger
triglyceride
trigonometric
trigonometry
trike
trilateral
trilby
trilemma
trilingual
trill
trillion
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