The Collaborative International Dictionary of English v.0.48:

Codify \Co"di*fy\ (? or ?; 277), v. t. [imp. & p. p. Codified;
   p. pr. & vb. n. Codifying.] [Code + -fy: cf. F. codifier.]
   To reduce to a code, as laws.
   [1913 Webster]

WordNet (r) 3.0 (2006):

codify
    v 1: organize into a code or system, such as a body of law;
         "Hammurabi codified the laws"

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "codify":
   adjust, alphabetize, analyze, arrange, assort, break down, catalog,
   categorize, chart, class, classify, coordinate, digest, divide,
   file, fix, formalize, grade, group, harmonize, index, list,
   methodize, normalize, order, organize, pigeonhole, place, plan,
   range, rank, rate, rationalize, regularize, regulate, routinize,
   settle, sort, standardize, subdivide, synchronize, systematize,
   tabulate, tune, tune up, type