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perfectionist

noun [C]
 
 
/pəˈfek.ʃən.ɪst/ US  /pɚ-/

Definition

a person who wants everything to be perfect and demands the highest standards possible: She's such a perfectionist that she notices even the tiniest mistakes.Wanting everything to be right
(Definition of perfectionist noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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