'senatorial' originates from Latin, specifically the word 'senator', where 'senex' meant 'old man, elder'.

'senatorial' changed from the Latin word 'senator' through Old French and Middle English forms (e.g. 'senatour') and eventually became the modern English adjective 'senatorial'.

Initially, it meant 'of or pertaining to a council of elders', but over time it evolved into its current meaning of 'relating to a senator or the Senate'.