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]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "localize":
   allocate, assign, box, box in, box up, circumscribe, collocate,
   confine, cramp, deploy, dispose, emplace, fix, get a fix, hem,
   hem in, home in on, install, keep from spreading,
   keep within bounds, limit, locate, narrow, navigate, pin down,
   pinpoint, place, position, put in place, qualify, restrict,
   situate, spot, stint, tighten, triangulate, zero in on