'accelerative' originates from Latin, specifically the word 'accelerare,' where 'ad-' meant 'toward' and 'celer' meant 'swift.'

'accelerare' transformed into the French word 'accélérer,' and eventually became the modern English word 'accelerate' through Middle English.

Initially, it meant 'to make swift,' but over time it evolved into its current meaning of 'tending to increase speed or rate of progress.'