Wordnet 3.0
NOUN (1)
1. 
 a game in which players hit a wooden ball through a series of hoops; 
 the winner is the first to traverse all the hoops and hit a peg; 
VERB (2)
1. 
 drive away by hitting with one's ball, "croquet the opponent's ball"; 
2. 
 play a game in which players hit a wooden ball through a series of hoops; 
The Collaborative International Dictionary of English v.0.48:
Croquet \Cro*quet"\, v. t. [imp. & p. p. Croqueted (-k?d); p.
   pr. & vb. n. Croqueting (-k?"?ng).]
   In the game of croquet, to drive away an opponent's ball,
   after putting one's own in contact with it, by striking one's
   own ball with the mallet.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Croquet \Cro*quet"\ (kr?-k?"), n. [From French; cf. Walloon
   croque blow, fillip. F. croquet a crisp biscuit, croquer to
   crunch, fr. croc a crackling sound, of imitative origin.
   Croquet then properly meant a smart tap on the ball.]
   [1913 Webster]
   1. An open-air game in which two or more players endeavor to
      drive wooden balls, by means of mallets, through a series
      of hoops or arches set in the ground according to some
      pattern.
      [1913 Webster]
   2. The act of croqueting.
      [1913 Webster]
WordNet (r) 3.0 (2006):
croquet
    n 1: a game in which players hit a wooden ball through a series
         of hoops; the winner is the first to traverse all the hoops
         and hit a peg
    v 1: drive away by hitting with one's ball, "croquet the
         opponent's ball"
    2: play a game in which players hit a wooden ball through a
       series of hoops