'annulability' originates from Latin, specifically the word 'annullare', where 'ad-' meant 'to' or 'toward' and 'nullus' meant 'none' or 'nothing'.

'annulability' changed from Old French 'anuler' and Middle English 'annullen' and eventually became the modern English word 'annul' with the addition of the suffixes '-able' and '-ity' to form 'annulability'.

Initially, it meant 'to make into nothing', but over time it evolved into its current meaning of 'capability of being declared void (especially legally)'.