(~s)
Note: in AM, usually use 'semifinal'
A ~ is one of the two matches or races in a competition that are held to decide who will compete in the final.
Steve Lewis won the first ~.
N-COUNT
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The ~s is the round of a competition in which these two matches or races are held.
He was beaten in the ~s by Chris Dittmar.
N-PLURAL: usu the N