Triangular/traɪˈæŋɡjələr/ Definition 1 of 3Pro Tip 1/3Physical Objects The term 'triangular' describes an object's three-cornered shape in the real world. She drew a triangular shape on the paper. Pro Tip 2/3Visual Representation 'Triangular' can visually refer to things resembling a triangle's geometric form. The building's triangular windows were eye-catching. Pro Tip 3/3Not Always Geometric An object can be generally 'triangular' without perfect straight edges or angles. His piece of pie had a roughly triangular shape.