The performance or execution of a contract or duty; a legal term meaning the doing of something, especially fulfilling an obligation.
From Old French 'faisance,' derived from Latin 'facere' (to make or do). The word entered English legal vocabulary in the Middle Ages and remains technical legal terminology.
Lawyers still use 'feasance' in phrases like 'malfeasance' and 'misfeasance,' but the plain form 'feasance' is almost never used alone—it's a root word that survives only in compounds, making it invisible to speakers who don't study law.
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