(1):

(a.) Having nice or quick sensibility; susceptible to slight impressions; acting keenly on the senses; sharp; keen; intense; as, a man of acute eyesight, hearing, or feeling; acute pain or pleasure.

(2):

(a.) Having nice discernment; perceiving or using minute distinctions; penetrating; clever; shrewd; - opposed to dull or stupid; as, an acute observer; acute remarks, or reasoning.

(3):

(a.) High, or shrill, in respect to some other sound; - opposed to grave or low; as, an acute tone or accent.

(4):

(a.) Attended with symptoms of some degree of severity, and coming speedily to a crisis; - opposed to chronic; as, an acute disease.

(5):

(v. t.) To give an acute sound to; as, he acutes his rising inflection too much.

(6):

(a.) Sharp at the end; ending in a sharp point; pointed; - opposed to blunt or obtuse; as, an acute angle; an acute leaf.