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Meaning of twenty-twenty

twen•ty-twen•ty

Pronunciation: (twen'tē-twen'tē, twun'tē-twun'tē), [key]
— adj.
  1. having normal visual acuity.
  2. keenly or acutely perceptive: an opinion based on twenty-twenty hindsight.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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