D defs.my
Entry 2 senses Webster, 1913

Perfectionist

· Per·fec·tion·ist · IPA /pɚˈfɛk.ʃənɪst/
01 n. One pretending to perfection; esp., one pretending to moral perfection; one who believes that persons may and do attain to moral perfection…
  1. 1.
    One pretending to perfection; esp., one pretending to moral perfection; one who believes that persons may and do attain to moral perfection and sinlessness in this life.
  2. 2.
    A person who insists on perfect results from himself or from others, in any endeavor.