The chances or likelihood that something will happen; numerical ratios expressing probability in betting or statistics.
Originally meaning 'unequal things', from the sense of 'odd' as unpaired or uneven. The gambling sense developed from the idea of unequal stakes, where differing amounts reflect different probabilities of outcomes.
The phrase 'at odds' meaning 'in disagreement' preserves the original sense of the word as 'unequal' or 'not matching'. This shows how mathematical concepts of probability grew from basic observations about things not being evenly matched or paired.
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