quadrangular adjective 2noun 1forms 3 adjective2 •Having the shape of a quadrangle; in the shape of a quadrangle. •Involving four participants or teams.We are promised certainly a triangular, and possibly a quadrangular, contest for Governor this Fall. — 1854 noun1 •A competition involving four participants or teams.With his winning shot put and discus marks in the quadrangular, Banich joined three other Bruins who have qualified for the NCAA outdoor championships in June at Baton Rouge, La. — 1987 formsquadrangulars · more quadrangular · most quadrangular