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: a musical canon (see canon entry 1 sense 6) that can be performed in retrograde (see retrograde entry 2 sense 2) as if read from a mirror placed at the end of the staff
: a musical canon (see canon entry 1 sense 6) that can be performed in inversion (see inversion sense 2d(3)) as if read from a mirror placed below the staff
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1952, in the meaning defined at sense 2
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