Etymology
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perfecta (n.)

method of betting in which the bettor must pick the first- and second-place finishers in correct order, 1971, from American Spanish perfecta, shortened from quiniela perfecta "perfect quiniela," a bet in horseracing (see quinella); for perfecta, see perfect (adj.).

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Definitions of perfecta

perfecta (n.)
a bet that you can pick the first and second finishers in the right order;
Synonyms: exacta
From wordnet.princeton.edu