The Collaborative International Dictionary of English v.0.48:

Regularize \Reg"u*lar*ize\ (r[e^]g"[-u]*l[~e]r*[imac]z), v. t.
   To cause to become regular; to regulate. [R.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

regularize
    v 1: bring into conformity with rules or principles or usage;
         impose regulations; "We cannot regulate the way people
         dress"; "This town likes to regulate" [syn: regulate,
         regularize, regularise, order, govern] [ant:
         deregulate]
    2: make regular or more regular; "regularize the heart beat with
       a pace maker" [syn: regularize, regularise]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "regularize":
   adjust, arrange, array, assimilate to, balance, chart, codify,
   cool off, coordinate, damp, deploy, dispose, equalize, equilibrize,
   even, even up, fix, flatten, form, formalize, grade, harmonize,
   hierarchize, homogenize, integrate, lay out, level, line up,
   make uniform, marshal, methodize, normalize, order, organize,
   pacify, plan, proportion, proportionate, quiet, rank, rationalize,
   regulate, routinize, set up, settle, smooth, stabilize,
   standardize, stereotype, structure, symmetrize, synchronize,
   systematize, tranquilize, tune, tune up, uniformize