The Collaborative International Dictionary of English v.0.48:

Localize \Lo"cal*ize\, v. t. [imp. & p. p. Localized; p. pr. &
   vb. n. Localizing.] [Cf. F. localiser. See Local.]
   To make local; to fix in, or assign to, a definite place.
   --H. Spencer. --Wordsworth.
   [1913 Webster]

WordNet (r) 3.0 (2006):

localize
    v 1: identify the location or place of; "We localized the source
         of the infection" [syn: place, localize, localise]
    2: concentrate on a particular place or spot; "The infection has
       localized in the left eye" [syn: localize, localise,
       focalize, focalise]
    3: restrict something to a particular area [syn: localize,
       localise]
    4: locate; "The film is set in Africa" [syn: set, localize,
       localise, place]