'averment' originates from Anglo-French, specifically the word 'averement', where 'averer' meant 'to assert'.

'averment' changed from Old French 'averement' (derived from 'averer') and was adopted into Middle English as 'averement', eventually becoming the modern English word 'averment'.

Initially, it meant 'a formal assertion or declaration', and over time it has largely retained this meaning, especially in legal contexts.