'addedly' originates from the English word 'add,' which comes from the Latin word 'addere,' where 'ad-' meant 'toward' and 'dare' meant 'to give.'

'addere' transformed into the French word 'ad(d)er,' and eventually became the modern English word 'add' through Middle English.

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