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n.1.(Math.) The difference between two quantities commensurable only in power, as between ?2 and 1, or between the diagonal and side of a square.
2.(Mus) The remaining part of a whole tone after a smaller semitone has been deducted from it; a major semitone.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.