Question

ac·cli·ma·tize
 ( also Brit   ac·cli·ma·tise) /əˈklaıməˌtaız/  verb  , -tiz·es, -tized, -tiz·ing
  : to adjust or adapt to a new climate, place, or situation : acclimate — usually + to
   [  no obj  ] The mountain climbers spent a few days acclimatizing [=becoming adjusted] to the high altitude.
   [  + obj  ] The mountain climbers spent a few days acclimatizing themselves to the high altitude.
  ac·cli·ma·ti·za·tion ( also Brit   ac·cli·ma·ti·sa·tion) /əˌklaımətəˈzeıʃən, Brit əˌklaıməˌtaıˈzeıʃən/  noun   [  noncount  ]