Wordnet 3.0
NOUN (1)
1. 
 a free kick from the corner awarded to the other side when a player has sent the ball behind his own goal line; 
The Collaborative International Dictionary of English v.0.48:
Corner \Cor"ner\, n. (Association Football) [More fully corner
   kick.]
   A free kick from close to the nearest corner flag post,
   allowed to the opposite side when a player has sent the ball
   behind his own goal line.
   [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
corner kick
    n 1: a free kick from the corner awarded to the other side when
         a player has sent the ball behind his own goal line