Etymology
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trilateral (adj.)

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.

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Definitions of trilateral
1
trilateral (adj.)
involving three parties;
trilateral talks
trilateral (adj.)
having three sides;
a trilateral figure
Synonyms: triangular / three-sided
2
trilateral (n.)
a three-sided polygon;
Synonyms: triangle / trigon
From wordnet.princeton.edu