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Acuteness

n.
  1. The quality of being acute or pointed; sharpness; as, the acuteness of an angle.
  2. The faculty of nice discernment or perception; acumen; keenness; sharpness; sensitiveness; -- applied to the senses, or the understanding. By acuteness of feeling, we perceive small objects or slight impressions: by acuteness of intellect, we discern nice distinctions.
  3. Shrillness; high pitch; -- said of sounds.
  4. (Med.) Violence of a disease, which brings it speedily to a crisis.