'disagreement' originates from the prefix 'dis-' meaning 'apart' or 'away' and the word 'agreement' from Old French 'agreer' meaning 'to please.'

'disagreement' evolved from the Old French word 'desagreer' and eventually became the modern English word 'disagreement.'

Initially, it meant 'to not be in accord,' and this meaning has largely remained the same in modern usage.