quadratic in WordNet English dictionary

1. a polynomial of the second degree
   quadratic  quadratic polynomial 
   
2. an equation in which the highest power of an unknown quantity is a square
   quadratic equation  quadratic 
   

1. of or relating to the second power
   "quadratic equation"
   quadratic 
   
2. of or relating to or resembling a square
   "quadratic shapes"
   quadratic