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

'demonstrativus' transformed into the Old French word 'demonstratif,' and eventually became the modern English word 'demonstrative' through Middle English.

Initially, it meant 'to show or point out,' but over time it evolved into its current meaning of 'showing feelings openly.'