The Collaborative International Dictionary of English v.0.48:

Acclimate \Ac*cli"mate\ (#; 277), v. t. [imp. & p. p.
   Acclimated; p. pr. & vb. n. Acclimating.] [F. acclimater;
   [`a] (l. ad) + climat climate. See Climate.]
   To habituate to a climate not native; to acclimatize. --J. H.
   Newman.
   [1913 Webster]