'demonstrator' originates from Latin, specifically the word 'demonstrator,' where 'demonstrare' meant 'to point out or show.'

'demonstrator' changed from the Latin word 'demonstrator' and eventually became the modern English word 'demonstrator'.

Initially, it meant 'one who shows or points out,' but over time it evolved into its current meanings of 'protester' and 'one who demonstrates a product or process.'