The Collaborative International Dictionary of English v.0.48:

Crecy \Crecy\ n.
   1. the first decisive battle of the Hundred Years' War; in
      1346 the English under Edward III defeated the French
      under King Philip of Valois.

   Syn: battle of Crecy.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Crecy
    n 1: the first decisive battle of the Hundred Years' War; in
         1346 the English under Edward III defeated the French under
         Philip of Valois [syn: Crecy, battle of Crecy]