The ability to acclimatize is an adaptation, but not the acclimatization itself.
From the en.wikipedia.org
After a few days of acclimatization, you can ease off on your water intake.
From the timesunion.com
Some kinds of acclimatization happen so rapidly that they are better called reflexes.
From the en.wikipedia.org
Doctors often prescribe Diamox to aid with the acclimatization process.
From the orlandosentinel.com
Athletes also can take advantage of altitude acclimatization to increase their performance.
From the en.wikipedia.org
No practice session during the heat acclimatization process can last more than three hours.
From the orlandosentinel.com
An overnight stay in Lone Pine at about 4,000 feet means later starts and less acclimatization.
From the ocregister.com
The races differ also in constitution, in acclimatization and in liability to certain diseases.
From the en.wikipedia.org
Only prior acclimatization to increased altitude offered a significant protective effect against AMS.
From the sciencedaily.com
More examples
Adaptation to a new climate (a new temperature or altitude or environment)
(acclimatize) get used to a certain climate; "They never acclimatized in Egypt"
Acclimatization or acclimation is the process of an individual organism adjusting to change in its environment, allowing it to survive changes in temperature, water and food availability, other stresses and often relates to seasonal weather changes. ...
The act of acclimatizing; the process of inuring to a new climate, or the state of being so inured
(acclimatize) To get used to a new climate; To make used to a new climate or one that is different from that which is natural; to inure or habituate to other circumstances; to adapt to the peculiarities of a foreign or strange climate
(Acclimatized) Becoming accustomed to a new climate or environment. Heat acclimatization requires up to 14 days 2-4 hours per day outside becoming accustomed to the hot environment. Heat acclimatization can be lost too, within 18-28 days of inactivity from hot environment.
The gradual adjustment of the body to new climatic or other environmental conditions, for example, the adjustment to low levels of oxygen at high altitudes.
The physiological adaptation to climatic variations.
Acclimatization refers to phenotypic changes by an organism to stresses in the natural environment that result in the readjustment of the organism's tolerance.