quadrangular

adj

1. Having the shape of a quadrangle; in the shape of a quadrangle.
2. Involving four participants or teams.

   “We are promised certainly a triangular, and possibly a quadrangular, contest for Governor this Fall.”

   “It is understood they will today consult lawyers about claims in a Sunday newspaper, attributed to a PCA official, that Collier leant on its chief executive, Sean Morris, to increase the pressure on the England players during the Test to sign a revised agreement with Stanford, scrapping the $20m Super Series but agreeing to a new quadrangular tournament at Lord's.”

   “Immediately after the US championship, St Louis will stage an elite quadrangular tournament with the world No 1, Carlsen, the world No 2, Hikaru Nakamura, the world No 3, Caruana, and the reigning world champion, Gukesh Dommaraju.”

noun

1. 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.”

   “"The PCA president and chief executive seem to have forgotten that not only were they signed up to Stanford's $20m match but that just this month they gave in principle support to a five-year deal for the quadrangular," said one ECB insider.”

   “Quadrangulars are a very rare format, and the only real precedent is St Petersburg 1895-96, with the world champion, Emanuel Lasker, the former champion Wilhelm Steinitz, Russia’s Mikhail Chigorin and USA’s Harry Pillsbury.”