'arbitrament' originates from Latin, specifically the word 'arbitramentum', where 'arbiter' meant 'judge' and the suffix '-mentum' was a noun-forming element.

'arbitrament' changed from Old French 'arbitrament' and Middle English forms such as 'arbitrement', and eventually became the modern English word 'arbitrament'.

Initially, it meant 'the act of judging or considering', but over time it evolved into its current meaning of 'a decision or settlement reached by arbitration'.