noun (n)

• the likelihood of a thing occurring rather than not occurring(noun.attribute)

  source: wordnet30
• the ratio by which one better's wager is greater than that of another(noun.linkdef)

  Example:
  He offered odds of two to one.
  

  Synonym:
  betting odds
  

  source: wordnet30
• Difference in favor of one and against another; excess of one of two things or numbers over the other; inequality; advantage; superiority; hence, excess of chances; probability.(noun)

  source: webster1913