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quad1 a large, open, usu. grassy area with buildings on all four sides, esp. on a college campus; quadrangle.
quad2 in printing, a piece of type that does not register, used for filling blank areas and spaces. [2 definitions]
quad3 a quadruplet.
quad4 quadraphonic. [2 definitions]
quad5 a unit of energy equal to one quadrillion British thermal units.
Quadragesima the first Sunday of Lent.
quadrangle a closed two-dimensional figure with four sides, such as a rectangle or parallelogram. [3 definitions]
quadrant one quarter of the arc of a circle. [5 definitions]
quadraphonic of, concerning, or used for the reproduction of sound, esp. music, over four distinct channels.
quadrat see "quad2." [2 definitions]
quadrate a square or rectangle. [5 definitions]
quadratic of, concerning, or involving mathematical expressions containing a variable that is raised to the second power at most. [2 definitions]
quadratic equation in algebra, an equation in which the square is the highest power to which the unknown quantity is raised.
quadrature the act or process of squaring. [3 definitions]
quadrennial happening once every four years. [3 definitions]
quadri- four.
quadriceps a group of four large muscles located at the front of the thigh.
quadrilateral having four sides. [2 definitions]
quadrille1 a formal square dance with five separate movements executed by four couples. [2 definitions]
quadrille2 an eighteenth-century card game for four players.
quadrillion the number represented by the Arabic numeral 1015. [2 definitions]