perfectionate
To make perfect or complete; to perfect.
archaic, transitive
[P]ainters and sculptors, cjoosing the most elegant natural beauties, perfectionate the idea, and advance their art above Nature itself in her individual productions; which is the utmost mastery of human performance.
Where it comes from
Borrowed from Middle French perfectionner (with common translation of French -er to English -ate; as in assassinate). Equivalent to perfection + -ate (verb-forming suffix).
Adapted from the Wiktionary entry perfectionate (CC BY-SA 4.0).