Definitions for "Non est factum"
Keywords:  plea, factum, est, mistake, void
The plea of the general issue in an action of debt on bond.
It is not my deed. Type of mistake where a person claims not to have understood the terms or effect of an agreement which they have signed
"it is not (his) deed". A plea that a person who has signed up to a deed or a contract lacked the necessary understanding or intent, and is therefore not bound by the document. A successful plea would void the contract.