'upgradableness' originates from English, specifically the base word 'upgrade' plus the suffixes '-able' and '-ness', where 'up-' meant 'higher' or 'toward' and 'grade' (from Latin 'gradus') meant 'step' or 'degree'.

'upgrade' developed in modern English by combining 'up' + 'grade' (with 'grade' from Old French/Latin 'gradus'), then the adjective-forming suffix '-able' produced 'upgradable', and the abstract noun suffix '-ness' produced 'upgradableness'.

Initially, 'upgrade' meant 'to raise to a higher grade or level'; over time this literal sense broadened to include improving, modernizing, or increasing capability, and 'upgradableness' thus means the capacity to undergo such improvement.