The Collaborative International Dictionary of English v.0.48:

Quattrocento \Quat`tro*cen"to\, n. & a. [It., four hundred, used
   as an abbreviated expression for the dates beginning with
   fourteen hundred.]
   The fifteenth century, when applied to Italian art or
   literature; as, the sculpture of the quattrocento;
   quattrocento style. -- Quat`tro*cen"tist, n.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

quattrocento
    n 1: the 15th century in Italian art and literature