Definition of "perfectionist"

perfectionist

/pɚˈfɛk.ʃənɪst/

noun
plural perfectionists
1. Someone who is unwilling to settle for anything that is not perfect or does not meet extremely high standards.
2. (philosophy, now rare) Someone who thinks that religious or moral perfection can be attained in this life.
  Quotations
  I have read in some of our perfectionists enough to make a better man than myself either run into madness or despair about the grace you mention […].
  1748, [Samuel Richardson], “Letter CXVI”, in Clarissa. Or, The History of a Young Lady: […], volumes (please specify |volume=I to VII), London: […] S[amuel] Richardson; […]
3. (US, historical) One of the Bible Communists or Free-lovers, a small American sect founded by J. H. Noyes (1811-86), which settled at Oneida in 1848, holding that the gospel if accepted secures freedom from sin.
adjective
comparative more perfectionist, superlative most perfectionist
1. Demanding perfection; being a perfectionist; imposing overly high standards.
2. (philosophy) Inclined or related to perfectionism.