Acclimatize v. t. : To inure or habituate to a climate different from that which is natural; to adapt to the peculiarities of a foreign or strange climate; said of man, the inferior animals, or plants.

Example:
What is so different about Mexico City that required athletes to spend time to 'Acclimatize'?

Taxonomy
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Defination from the web:
acclimatize from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "acclimatize" Learn more about "acclimatize" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: ...