The quadratic equation can be solved using the quadratic formula.

The Olympic Games are held on a quadrennial basis.

He completed his undergraduate degree in a quadrennium.

The city is celebrating its quadricentennial with a series of events and exhibitions.

A square is a type of quadrilateral.

They performed a lively quadrille at the dance party.

The committee was formed as a quadripartite group consisting of representatives from four different organizations.

The quadrivium was a set of four subjects taught in medieval universities, including arithmetic, geometry, astronomy, and music.

She is a quadroon, with one of her grandparents being of African descent.

The lion is a quadruped.