Instant runoff voting (IRV), also known as the Alternative Vote (AV), is a form of preferential voting (ranked choice voting). Under the IRV voting system voters rank candidates in order of preference, most commonly in single-winner elections. If no candidate is the first preference of a majority of voters, the candidate with the fewest number of first preference rankings is eliminated and that candidate’s ballots are redistributed at full value to the remaining candidates according to the next preference on each ballot. This process is repeated until one candidate obtains a majority of votes among the remaining candidates.
The Daily Omnivore 
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