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| A [ ay ] (plural A's or As) |
noun |
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1. 'A'-shaped object: something shaped like a letter 'A'
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2. music 6th note in C major: the sixth note of a scale in C major. The A above middle C is often used to tune instruments and is standardized at a frequency of 440 hertz.
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3. music something that produces A: a string, key, or pipe tuned to produce the note A
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4. music scale beginning on A: a scale or key that starts on the note A
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5. music written symbol of A: a graphic representation of the tone of A
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6. education highest grade: the highest grade in a series, e.g. a top grade for academic work
See also alphan (sense 2)
  straight As in her exams.
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7. medicine human blood type: a human blood type of the ABO system, containing the A antigen. Somebody with this type of blood can donate to people of the same group or of the AB group, and can receive blood from people with this type or with type O.
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8. social sciences senior manager or professional: in the market research system that classifies people according to their occupation, somebody in a senior management, professional, or administrative position
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from A to B from one place to another
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from A to Z
1. extremely thoroughly
2. all the way from the beginning to the end
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