acclimatization

They were 'ravaged by disease, and literally decimated year by year in the process of acclimatization.'

The research upon acclimatization is considerable, although there is far from unanimity of opinion in regard to its findings.

Another advantage upon the Boer side consists in complete acclimatization and perfect knowledge of the country.

The acclimatization of tropical people in temperate regions will never be a question of widespread importance.

This is sometimes called acclimatization, but it proves the contention, whichever way it is interpreted.