Acclimation n. : The process of becoming, or the state of being, acclimated, or habituated to a new climate; acclimatization.

Example:
What does a 48 hour Acclimation mean?

Taxonomy
Humans, Plants, Altitude Acclimatization, free encyclopedia, US Army, Altitude physiology, Animals, heat, sweat, Heat Acclimation, altitude, search, organism, adjusting, food availability, stresses, seasonal weather changes, short time.

Defination from the web:
acclimation is the process of an organism adjusting to change in its environment, allowing it to survive changes in ... Acclimatization occurs in a short time, (days to weeks) and within one organism's lifetime (compare adaptation) ...