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: greater than normal acuteness of a sense
Her anarchy is perfectly balanced with her hyperacuity about tone and timbre and atmosphere and drift.— Charles Baxter
: visual acuity that is better than twenty-twenty
1887, in the meaning defined above
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: greater than normal acuteness especially of a sense
: visual acuity that is better than twenty-twenty — compare grating acuity, stereoacuity, vernier acuity
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to make faulty or ineffective
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