Definitions from Wiktionary ( )

▸ adjective:  Brief, quick, short.
▸ adjective:  High or shrill.
▸ adjective:  Intense; sensitive; sharp.
▸ adjective:  Urgent.
▸ adjective:  (botany) With the sides meeting directly to form an acute angle (at an apex or base).
▸ adjective:  (geometry, of an angle) Less than 90 degrees.
▸ adjective:  (geometry, of a triangle) Having all three interior angles measuring less than 90 degrees.
▸ adjective:  (linguistics, chiefly historical) Of an accent or tone: generally higher than others.
▸ adjective:  (phonology, dated, of a sound) Sharp, produced in the front of the mouth. (See Grave and acute on Wikipedia.Wikipedia)
▸ adjective:  (medicine) Of an abnormal condition of recent or sudden onset, in contrast to delayed onset; this sense does not imply severity, unlike the common usage.
▸ adjective:  (medicine) Of a short-lived condition, in contrast to a chronic condition; this sense also does not imply severity.
▸ adjective:  (orthography) After a letter of the alphabet: having an acute accent.
▸ noun:  (medicine, informal) A person who has the acute form of a disorder, such as schizophrenia.
▸ noun:  (linguistics, chiefly historical) An accent or tone higher than others.
▸ noun:  (orthography) An acute accent (´).
▸ verb:  (transitive, phonetics) To give an acute sound to.
▸ verb:  (transitive, archaic) To make acute; to sharpen, to whet.

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