Definition of triangular
1a
: of, relating to, or having the form of a triangle
a triangular plot of land
b
: having a triangular base or principal surface
a triangular table a triangular pyramid
2a(1)
: of, relating to, or involving three elements
a triangular agreement
(2)
of a military group
: based primarily on three units
b
: of or relating to a love triangle
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Merriam-Webster unabridged
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Time Traveler for triangular
The first known use of triangular was in the 14th century
See more words from the same century