'avowance' originates from Old French, specifically the word 'avouance' (from verb 'avouer'), where the root meant 'to admit, acknowledge'.

'avowance' passed into Middle English from Old French 'avouance' (or 'avouer') and eventually became the modern English noun 'avowance'.

Initially, it meant 'a declaration or admission', and over time it has retained that basic meaning though its use has become rare and more specialized (e.g., legal contexts).