'acclimatiser' originates from the French word 'acclimater,' where 'ac-' meant 'to' and 'climat' meant 'climate.'

'acclimater' transformed into the English word 'acclimatize,' and eventually became the noun 'acclimatiser.'

Initially, it meant 'to adapt to a climate,' but over time it evolved into its current meaning of 'a device or person that helps in adaptation.'