Which term describes a gradual adjustment to a new environment or routine?

The term that best describes a gradual adjustment to a new environment or routine is "acclimate." This word specifically refers to the process of becoming accustomed to a new climate or environment, allowing an individual to function effectively within it. Acclimation often involves physical changes or adaptations that occur over time, making it particularly relevant in situations involving shifts in surroundings, such as moving to a different geographical area or transitioning to a new schedule.

The nuance of acclimating implies a gradual process, emphasizing how individuals may need time to adjust and possibly undergo physiological or psychological changes before feeling comfortable in the new setting. This gradual nature is what sets acclimate apart from other options.

While 'adapt' can also refer to adjusting to new conditions, it generally has a broader application that might not specifically indicate the gradual nature of the change. 'Assimilate' typically suggests a more comprehensive integration into a community or culture, which may not always involve the slow process of acclimation. Similarly, 'adjust' often implies a quicker, less nuanced change compared to the more gradual process associated with acclimation. Therefore, acclimate is the most precise term for the gradual adjustment described in the question.