British spelling of acclimate; to adjust or become adjusted to a new climate or environment.
From French 'acclimater,' spelled with 's' in British English per regional conventions. The verb form uses the base infinitive.
If you read a British ecology textbook, you'll see 'acclimatise,' but switch to an American one and it becomes 'acclimate'—same word, split by an ocean and standardized spelling conventions from the 1800s!
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