pertaining to or having the form of a triangle; three-cornered.
having a triangle as base or cross section: a triangular prism.
comprising three parts or elements; triple.
pertaining to or involving a group of three, as three persons, parties, or things.

Origin of triangular

1535–45; < Latin triangulāris, equivalent to triangul(um) triangle + -āris -ar1
Related formstri·an·gu·lar·i·ty [trahy-ang-gyuh-lar-i-tee] /traɪˌæŋ gyəˈlær ɪ ti/, nountri·an·gu·lar·ly, adverbsub·tri·an·gu·lar, adjectivesub·tri·an·gu·lar·i·ty, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for triangular

Contemporary Examples of triangular

Historical Examples of triangular

  • The lapels were, of course, soft-rolled and joined the collar with a triangular notch.

    Ruggles of Red Gap

    Harry Leon Wilson

  • Lay the slices one on the other, and cut in triangular shapes.

    The Skilful Cook

    Mary Harrison

  • Here is the famous "triangular bridge," a relic of the abbey.

  • Then we could find nothing by traveling toward the triangular cluster?

    Cogito, Ergo Sum

    John Foster West

  • You look over the whole town, which here appears in a triangular form.

    A Tour in Ireland

    Arthur Young

British Dictionary definitions for triangular



Also: trigonal of, shaped like, or relating to a triangle; having three corners or sides
of or involving three participants, pieces, or units
maths having a base shaped like a triangle
Derived Formstriangularity (traɪˌæŋɡjʊˈlærɪtɪ), nountriangularly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for triangular

1540s, from Late Latin triangularis, from triangulum (see triangle).

Online Etymology Dictionary, © 2010 Douglas Harper