A-

A- or a- may refer to: ;A-hyphen * A- (plane), a U.S. military aircraft prefix * Privative a, a prefix expressing negation * Copulative a, a prefix expressing unification

;A-minus * A−, a blood type in the ABO blood group system * A− (grade), an educational grade in the letter-grading system, above B+ but below A Provided by Wikipedia

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