Acute may refer to: Language Acute accent, a diacritic used in many modern written languages Acute (phonetic), a perceptual classification Science and mathematics Acute angle Acute triangle Acute, a leaf shape in the glossary of leaf morphology Acute (medicine), a disease that it is of short duration and of recent onset. Acute toxicity, the adverse effects of a substance from a single exposure or in a short period of time See also Acutance, in photography, subjective perception of sharpness related to the edge contrast of an image Acuity (disambiguation)