Definition of perfectionists:
(n) :
Someone who is unwilling to settle for anything that is not perfect or does not meet extremely high standards.
(adj) :
Demanding perfection; being a perfectionist; imposing overly high standards.
(adj) :
(philosophy) Inclined or related to perfectionism.
(n) :
(philosophy, now rare) Someone who thinks that religious or moral perfection can be attained in this life.
(n) :
(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.