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acute accent a diacritical mark (´), placed over a vowel to indicate length or high pitch, or to indicate primary stress of a syllable. (Cf. grave accent.)
acute angle an angle of less than ninety degrees.
Severe Acute Respiratory Syndrome an atypical pneumonia that has a mortality rate of approximately 10 percent, often referred to by its acronym "SARS." A major outbreak occurred in 2003.