1) Capability 2) Capableness 3) Perfectability 4) Potentiality 1) Perfectability 
• (n.) The quality or state of being perfectible.
Per·fect`i·bil'i·ty noun [ Confer French perfectibilité .] The quality or state of being perfectible. 
[n] - the capability of becoming perfect
noun the capability of becoming perfect; `he believes in the ultimate perfectibility of man`
The optimistic belief in the ability of man to attain an eventual complete realization of his moral possibilities. Opposed to the various philosophies and theologies of moral pessimism (e.g., the sinfulness and moral impotence of man, original sin, in Augustinianism, Lutheranism, Barthianism, et al.) -- V.F. See Condorcet, Enlightenment.