'questioner' originates from Middle English, from Old French 'question' (or 'questioun'), ultimately from Latin 'quaestio' (from 'quaerere') where 'quaerere' meant 'to seek, ask'.

'questioner' changed from Middle English 'questioner' (influenced by Old French 'questioun'/'question'), and eventually became the modern English word 'questioner'.

Initially it meant 'one who asks or seeks information', and over time it has retained that core meaning while also being used for those who challenge or doubt.