- Noun. The quality of being acute or pointed; as, the acuteness of an angle.
- Noun. The faculty of nice discernment or perception; 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.
- Noun. Shrillness; high pitch; – said of sounds.
- Noun. Violence of a disease, which brings it speedily to a crisis.
- Noun. Shrewdness, quickness of mind.