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A Key in which music is played, consisting of three sharps or flats.
A major scale:

1 2 3 4 5 6 7 8
A B C# D E F# G# A
by Levi Morris June 24, 2006
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Nov 23 Word of the Day
A massive dump that takes 10 to 15 times to flush.
After Thanksgiving, I had to Take a Trump.
by JRBIV December 11, 2019
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