n. sing. &  1.  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. The odds are often expressed by a ratio;  
2.  Quarrel; dispute; debate; strife;  chiefly in the phrase at odds.

Noun  1.  odds  the probability of a specified outcome Synonyms: likelihood, likeliness 
2.  odds  the ratio by which one better's wager is greater than that of another; "he offered odds of two to one" Synonyms: betting odds 