What does triangular mean?
Triangular is an adjective meaning shaped like a triangle or involving three sides, angles, or vertices. It is common in descriptions of architecture, design, sails, flags, roads, and other objects whose outline is formed by three straight edges. In mathematics, it appears in terms such as triangular prism and triangular numbers, where it identifies a relationship based on three vertices or the arrangement of objects in successive rows. The word is used in both formal and informal contexts and carries no strong emotional connotation; its associations are mainly geometric and precise. Triangular is especially useful because it describes a characteristic shape more directly than a vague phrase such as three-cornered. Its Latin form, triangularis, was derived from triangulum, meaning a triangle, which in turn reflects Greek roots meaning “three” and “angle.”
adjectiveHaving the shape of a triangle, especially having three sides or three vertices. In mathematics, relating to or involving a triangle or a geometric structure with three vertices.
- Having the shape of a triangle; having three sides or corners.
- Relating to or involving a triangle or a geometric structure with three vertices.
"The architect designed the modern church with a striking triangular façade."
"The kite has a simple triangular shape that makes it easy to assemble."
"The report identifies a triangular relationship among the three variables."
From Latin for “three-cornered,” triangular points to the number three: a triangle has three sides, three angles, and three vertices.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does triangular come from?
Triangular comes from Latin triangularis, meaning “three-cornered” or “triangular,” formed from triangulum, “triangle.” The Latin word triangulum derives from Greek trigonon, literally “three-angled,” from tri-, meaning “three,” and gonia, meaning “angle.” English borrowed the Latin adjectival form during the early modern period and established it in general and mathematical usage.
Related word forms
How triangular is actually used
This is standard formal and informal English in both British and American usage. Its meaning is primarily geometric, though it can also describe objects arranged in a three-part pattern.