perfectioning
/pəˈfɛkʃənɪŋ/ /pəˈfɛkʃ(ə)nɪŋ/noun
The action of bringing something to perfection.
Origin
Mid 16th century; earliest use found in Nicholas Udall (1504–1556), schoolmaster and playwright. Originally from perfection + -ing. In later use also from perfection + -ing.