Wordnet 3.0
NOUN (2)
1. 
 the act of codifying; 
 arranging in a systematic order; 
2. 
 a set of rules or principles or laws (especially written ones); 
[syn: code, codification]
The Collaborative International Dictionary of English v.0.48:
Codification \Co`di*fi*ca"tion\ (? or ?), n. [Cf. F.
   codification.]
   The act or process of codifying or reducing laws to a code.
   [1913 Webster]
WordNet (r) 3.0 (2006):
codification
    n 1: the act of codifying; arranging in a systematic order
    2: a set of rules or principles or laws (especially written
       ones) [syn: code, codification]