Runoff voting can refer to:
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election methods where candidates are eliminated based on comparison of votes tallies:
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Two-round system, a voting system where only the top two candidates from the first round continue to the second round.
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Instant-runoff voting, an electoral system where votes rank candidates and if necessary last-place candidates are eliminated one by one until one candidate has a majority of votes.
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Contingent vote, a preferential ballot version of the two-round system.
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Exhaustive ballot, an iterated voting system where if necessary, numerous rounds of voting are held sequentially. Last-place candidates are eliminated one by one until a round of voting sees a candidate receive a majority of votes.