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Noun: sharp-sightedness  'shaa(r)p'sI-tid-nus
  1. Sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
    - acuity, visual acuity
     
  2. Lively attentiveness
    - alertness, on the qui vive

Type of: attentiveness, sight, vision, visual modality, visual sense