Acuity

Acuity refers to the sharpness or keenness of thought, vision, or hearing

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• Oxford Dictionaries: "Sharpness or keenness of thought, vision, or hearing"

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• Merriam-Webster: "Keenness of perception"

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Examples include:

• Visual Acuity: The clarity or sharpness of vision.
• Mental Acuity: The sharpness of the mind, including quick thinking and understanding.

Synonyms for acuity include insight, discernment, perception, and sharpness

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