1. 
[syn: even, fifty-fifty]
The Collaborative International Dictionary of English v.0.48:
fifty-fifty \fifty-fifty\ adj.
   equally large; -- of probabilities.
   Syn: even.
        [WordNet 1.5 +PJC]
The Collaborative International Dictionary of English v.0.48:
fifty-fifty \fifty-fifty\ n.
   a lottery in which the organizers retain fifty percent of the
   money wagered, and distribute fifty percent of the wagered
   money to the winner.
   [PJC]
WordNet (r) 3.0 (2006):
fifty-fifty
    adj 1: equal in degree or extent or amount; or equally matched
           or balanced; "even amounts of butter and sugar"; "on even
           terms"; "it was a fifty-fifty (or even) split"; "had a
           fifty-fifty (or even) chance"; "an even fight" [syn:
           even, fifty-fifty]