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acute

adjective (ANGLE)
 
 
/əˈkjuːt/

Definition

describes an angle that is less than 90 degrees → Compare obtuse, reflexDescribing angles, lines and orientations acuteness
 
 
/-nəs/ noun [U]
PerceptiveUsing the eyesIntelligence
(Definition of acute adjective (ANGLE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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