'acclimatize' originates from French, specifically the word 'acclimater,' where 'a-' meant 'to' and 'climat' meant 'climate.'

'acclimater' transformed into the English word 'acclimatize,' and eventually became the modern English word 'acclimatized.'

Initially, it meant 'to adapt to a climate,' and this meaning has largely remained the same in modern usage.