Quote Originally Posted by salsabike View Post
It's like "use" and "utilize". Either is correct.

http://dictionary.reference.com/browse/acclimate. ac⋅cli⋅mate
  /ˈækləˌmeɪt, əˈklaɪmɪt/ Show Spelled Pronunciation [ak-luh-meyt, uh-klahy-mit] Show IPA
Use acclimate in a Sentence
–verb (used with object), verb (used without object), -mat⋅ed, -mat⋅ing.
to accustom or become accustomed to a new climate or environment; adapt.

http://dictionary.reference.com/browse/acclimatize. c⋅cli⋅ma⋅tize
  /əˈklaɪməˌtaɪz/ Show Spelled Pronunciation [uh-klahy-muh-tahyz] Show IPA
Use acclimatize in a Sentence
–verb (used with object), verb (used without object), -tized, -tiz⋅ing.
to acclimate.
hhahahaha I was just going to look that up. Thanks for saving me the work.