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Meaning of odd or even

odd' or e'ven

Pronunciation: [key]
  1. any of various games of chance in which one bets on an odd or even number, as one in which two players alternately draw from a pile of an odd number of counters any desired number up to a prearranged limit, the object being to have drawn an odd number of counters at the end of the game.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.