'annuality' originates from Latin, specifically the Medieval Latin word 'annualitas', where 'annus' meant 'year'.

'annuality' changed from the Medieval Latin word 'annualitas' and was adopted into English (via Late Latin/Medieval Latin usage) as 'annuality'.

Initially, it referred generally to 'yearlyness' or the condition of being yearly; over time it has retained that core sense and also acquired specialized use in contexts such as finance (yearly payment).