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Definition of A-sharp major
1. Noun. (music) the major key with A-sharp as its tonic and the notes A#, B#, C##, D#, E#, F##, G##. Such high numbers of accidentals (especially double sharp double sharps) are undesirable. Therefore, it is usually scored and referred to as its enharmonic equivalent; B-flat major. ¹
2. Noun. (music) the major chord with a root of A-sharp ¹
¹ Source: wiktionary.com