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.
2. Quarrel; dispute; debate; strife; -- chiefly in the phrase at odds.
4. the likelihood of a thing occurring rather than not occurring
5. the ratio by which one better's wager is greater than that of another
The bookie offered odds of two to one.