1. Plural of acuity; the quality of being sharp, keen, or acute in perception, thought, or vision.
Usage: Most commonly used in medical and scientific contexts to refer to sharpness of vision or hearing.
2. Instances or degrees of mental sharpness, insight, or discernment.
Usage: Used in formal or academic writing to describe intellectual clarity.

Examples

• The doctor tested the patient's visual acuities in both eyes.
• Her mental acuities remained sharp well into her nineties.
• Different acuities of hearing are common among people of various ages.
• The researcher measured the acuities of the subjects' sensory perception.
• His analytical acuities made him an excellent problem-solver.
• Age can affect the acuities of vision and hearing.
• The test evaluated multiple cognitive acuities including memory and reasoning.