'addibility' originates from the base word 'add', combined with the suffix '-ibility', which denotes the quality or state of being able to be added.

'add' changed from the Latin word 'addere', which transformed into the French word 'ad(d)er', and eventually became the modern English word 'add'. The suffix '-ibility' is derived from Latin '-ibilitas', indicating capability or suitability.

Initially, 'add' meant 'to give or add something', and this meaning has largely remained the same in modern usage.