the doing or performing of an act, as of a condition or duty.
Origin of feasance
1530–40; < Anglo-French fesa(u)nce, Old French faisance, equivalent to fais- (variant stem of faire ≪ Latin facere to do) + -ance -ance
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
1530s, from Anglo-French fesance, from Old French faisance "action, deed, enactment," from faisant, present participle of faire "to make, do" (from Latin facere; see factitious).
Online Etymology Dictionary, © 2010 Douglas Harper