1.Definition: ending in a sharp point

Related Adjective(s):acuate, needlelike, sharp

2.Definition: extremely sharp or severe

"Acute pain", "Felt acute annoyance"

Related Adjective(s):intense

3.Definition: having or demonstrating ability to recognize or draw fine distinctions

"An acute observer of politics and politicians"

Related Adjective(s):discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp

4.Definition: having or experiencing a rapid onset and short but severe course

"Acute appendicitis", "The acute phase of the illness", "Acute patients"

5.Definition: of an angle; less than 90 degrees

6.Definition: of critical importance and consequence

"An acute (or critical) lack of research funds"