'agreement' originates from Old French, specifically the word 'agreer', where 'a-' meant 'to' and 'gre' meant 'thank, favor'.

'agreer' transformed into the Middle English word 'agrement', and eventually became the modern English word 'agreement'.

Initially, it meant 'to be in favor or to please', but over time it evolved into its current meaning of 'a mutual understanding or arrangement'.