triangular

adjective

tri·​an·​gu·​lar trī-ˈaŋ-gyə-lər 

1

a

: 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

2

a(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

triangularity

(ˌ)trī-ˌaŋ-gyə-ˈler-ə-tē 

-ˈla-rə-tē

noun

triangularly

trī-ˈaŋ-gyə-lər-lē 

adverb

Examples of triangular in a Sentence

Recent Examples on the Web

This is enlivened by triangular windows and the actual inside shape of the home is really eye-catching. —Adam Williams, New Atlas, 14 Oct. 2024

The mission will deploy three spacecraft that will scour the universe, separated by about 1.5 million miles while flying in a triangular formation. —Eric Lagatta, USA TODAY, 26 Oct. 2024

The outline of the triangular ribs of the building’s core can be seen from the ground looking up. —Jessica Gelt, Los Angeles Times, 25 Oct. 2024

The triangular forms in her pieces symbolize both the island’s enigmatic history and the craftsmanship passed down through generations of her family. —Shelby Stewart, Essence, 24 Oct. 2024

Word History

Etymology

Middle English trianguler, from Late Latin triangularis, from Latin triangulum

First Known Use

14th century, in the meaning defined at sense 1a

Phrases Containing triangular

• triangular number

Kids Definition

triangular

adjective

tri·​an·​gu·​lar trī-ˈaŋ-gyə-lər 

1

: of, relating to, or having the form of a triangle

2

: having a triangular base or principal surface

a triangular pyramid

Medical Definition

triangular

noun

tri·​an·​gu·​lar trī-ˈaŋ-gyə-lər 

: triquetral bone