noun
perfecta; exacta; straight forecast
Abbreviation of 連勝単式. A bet type where the bettor must predict the first and second place finishers in exact order. Used in horse racing, boat racing, and similar sports.
See also: 連勝単式
競馬で連単を買ったら、見事に的中した。
I bought a perfecta ticket at the horse races and it hit perfectly.