'deletability' originates from English, formed from the verb 'delete' + the suffix '-ability', where 'delete' ultimately comes from Latin 'delēre' meaning 'to blot out/erase' and the suffix '-ability' derives from Latin '-abilitas' meaning 'ability'.

'deletability' was created in modern English by attaching the productive adjective/nominalizing suffix '-ability' to 'delete'. The verb 'delete' entered English from Latin 'delēre' (via Late/Medieval Latin and scholarly usage), and the combined form produced the modern noun 'deletability'.

Initially the Latin root 'delēre' meant 'to blot out' or 'erase'; over time English formations have regularized this into abstract nouns expressing the capacity to be erased, as in 'deletability'.